16161840 has 60 divisors (see below), whose sum is σ = 54279264. Its totient is φ = 4309632.

The previous prime is 16161839. The next prime is 16161853. The reversal of 16161840 is 4816161.

16161840 is a `hidden beast` number, since 1 + 6 + 1 + 618 + 40 = 666.

16161840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×16161840² = 522410144371200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10504 + ... + 11943.

Almost surely, 2^16161840 is an apocalyptic number.

16161840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16161840 is an abundant number, since it is smaller than the sum of its proper divisors (38117424).

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

16161840 is a wasteful number, since it uses less digits than its factorization.

16161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22466 (or 22457 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 16161840 is about 4020.1791004879. The cubic root of 16161840 is about 252.8309681391.

It can be divided in two parts, 161 and 61840, that added together give a square (62001 = 249²).

The spelling of 16161840 in words is "sixteen million, one hundred sixty-one thousand, eight hundred forty".