Search a number
-
+
145387447 = 33121327
BaseRepresentation
bin10001010101001…
…10111110110111
3101010120110002021
420222212332313
5244204344242
622232054011
73413526052
oct1052467667
9333513067
10145387447
1175081817
1240834307
132417559a
1415447a99
15cb6cb67
hex8aa6fb7

145387447 has 6 divisors (see below), whose sum is σ = 145937904. Its totient is φ = 144838980.

The previous prime is 145387423. The next prime is 145387471. The reversal of 145387447 is 744783541.

It is an interprime number because it is at equal distance from previous prime (145387423) and next prime (145387471).

It is not a de Polignac number, because 145387447 - 223 = 136998839 is a prime.

It is a super-3 number, since 3×1453874473 (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145387477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108898 + ... + 110224.

It is an arithmetic number, because the mean of its divisors is an integer number (24322984).

Almost surely, 2145387447 is an apocalyptic number.

145387447 is the 6962-nd hex number.

145387447 is a deficient number, since it is larger than the sum of its proper divisors (550457).

145387447 is an frugal number, since it uses more digits than its factorization.

145387447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1658 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 145387447 is about 12057.6717072576. The cubic root of 145387447 is about 525.8262991054.

The spelling of 145387447 in words is "one hundred forty-five million, three hundred eighty-seven thousand, four hundred forty-seven".

Divisors: 1 331 1327 109561 439237 145387447