161518940 has 24 divisors (see below), whose sum is σ = 370025712. Its totient is φ = 58734080.

The previous prime is 161518937. The next prime is 161518957. The reversal of 161518940 is 49815161.

It is a self number, because there is not a number n which added to its sum of digits gives 161518940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366869 + ... + 367308.

It is an arithmetic number, because the mean of its divisors is an integer number (15417738).

Almost surely, 2^161518940 is an apocalyptic number.

161518940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161518940 is an abundant number, since it is smaller than the sum of its proper divisors (208506772).

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

161518940 is a wasteful number, since it uses less digits than its factorization.

161518940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734197 (or 734195 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161518940 is about 12709.0101896253. The cubic root of 161518940 is about 544.5960477747.

The spelling of 161518940 in words is "one hundred sixty-one million, five hundred eighteen thousand, nine hundred forty".