161845740 has 72 divisors (see below), whose sum is σ = 561069600. Its totient is φ = 36993024.

The previous prime is 161845693. The next prime is 161845751. The reversal of 161845740 is 47548161.

It is a happy number.

161845740 is a `hidden beast` number, since 1 + 6 + 1 + 84 + 574 + 0 = 666.

161845740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161845740² = 52388087112295200, 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 = 161845695 and 161845704.

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, 62965 + ... + 65484.

Almost surely, 2^161845740 is an apocalyptic number.

161845740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161845740 is an abundant number, since it is smaller than the sum of its proper divisors (399223860).

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

161845740 is a wasteful number, since it uses less digits than its factorization.

161845740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128471 (or 128466 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 161845740 is about 12721.8607129618. The cubic root of 161845740 is about 544.9630926386.

The spelling of 161845740 in words is "one hundred sixty-one million, eight hundred forty-five thousand, seven hundred forty".