16388140 has 12 divisors (see below), whose sum is σ = 34415136. Its totient is φ = 6555248.

The previous prime is 16388123. The next prime is 16388171. The reversal of 16388140 is 4188361.

It is a super-2 number, since 2×16388140² = 537142265319200, which contains 22 as substring.

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, 409684 + ... + 409723.

It is an arithmetic number, because the mean of its divisors is an integer number (2867928).

Almost surely, 2^16388140 is an apocalyptic number.

16388140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16388140 is an abundant number, since it is smaller than the sum of its proper divisors (18026996).

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

16388140 is a wasteful number, since it uses less digits than its factorization.

16388140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819416 (or 819414 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 16388140 is about 4048.2267723041. The cubic root of 16388140 is about 254.0055592228.

The spelling of 16388140 in words is "sixteen million, three hundred eighty-eight thousand, one hundred forty".