161623040 has 44 divisors (see below), whose sum is σ = 387718176. Its totient is φ = 64647168.

The previous prime is 161623039. The next prime is 161623069. The reversal of 161623040 is 40326161.

It is a happy number.

It is a super-2 number, since 2×161623040² = 52244014117683200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161622997 and 161623015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10664 + ... + 20903.

Almost surely, 2^161623040 is an apocalyptic number.

161623040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161623040 is an abundant number, since it is smaller than the sum of its proper divisors (226095136).

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

161623040 is an equidigital number, since it uses as much as digits as its factorization.

161623040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31592 (or 31574 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 161623040 is about 12713.1050495149. The cubic root of 161623040 is about 544.7130212050.

The spelling of 161623040 in words is "one hundred sixty-one million, six hundred twenty-three thousand, forty".