145447740 has 72 divisors (see below), whose sum is σ = 453136320. Its totient is φ = 37736064.

The previous prime is 145447727. The next prime is 145447759. The reversal of 145447740 is 47744541.

It is a happy number.

145447740 is a `hidden beast` number, since 1 + 4 + 544 + 77 + 40 = 666.

It is a super-2 number, since 2×145447740² = 42310090142215200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 145447695 and 145447704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4260 + ... + 17579.

It is an arithmetic number, because the mean of its divisors is an integer number (6293560).

Almost surely, 2^145447740 is an apocalyptic number.

145447740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145447740 is an abundant number, since it is smaller than the sum of its proper divisors (307688580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145447740 is a wasteful number, since it uses less digits than its factorization.

145447740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21891 (or 21886 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 36.

The square root of 145447740 is about 12060.1716405696. The cubic root of 145447740 is about 525.8989767772.

It can be divided in two parts, 1454 and 47740, that added together give a palindrome (49194).

The spelling of 145447740 in words is "one hundred forty-five million, four hundred forty-seven thousand, seven hundred forty".