Search a number
-
+
1990280537 = 71987143093
BaseRepresentation
bin111011010100001…
…0100010101011001
312010201001201121222
41312220110111121
513034002434122
6525254341425
7100215051110
oct16650242531
95121051558
101990280537
11931509253
1247665a875
132594533bb
1414c488c77
15b9ae2b42
hex76a14559

1990280537 has 8 divisors (see below), whose sum is σ = 2275766976. Its totient is φ = 1705084272.

The previous prime is 1990280519. The next prime is 1990280557. The reversal of 1990280537 is 7350820991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990280537 - 26 = 1990280473 is a prime.

It is a super-2 number, since 2×19902805372 = 7922433231922016738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990280557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57638 + ... + 85455.

It is an arithmetic number, because the mean of its divisors is an integer number (284470872).

Almost surely, 21990280537 is an apocalyptic number.

It is an amenable number.

1990280537 is a deficient number, since it is larger than the sum of its proper divisors (285486439).

1990280537 is a wasteful number, since it uses less digits than its factorization.

1990280537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145087.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 1990280537 is about 44612.5603053669. The cubic root of 1990280537 is about 1257.8767754303.

The spelling of 1990280537 in words is "one billion, nine hundred ninety million, two hundred eighty thousand, five hundred thirty-seven".

Divisors: 1 7 1987 13909 143093 1001651 284325791 1990280537