16139972 has 12 divisors (see below), whose sum is σ = 28562940. Its totient is φ = 7979136.

The previous prime is 16139971. The next prime is 16139983. The reversal of 16139972 is 27993161.

It is a happy number.

16139972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7043716 + 9096256 = 2654^2 + 3016^2 .

It is not an unprimeable number, because it can be changed into a prime (16139971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22313 + ... + 23024.

It is an arithmetic number, because the mean of its divisors is an integer number (2380245).

Almost surely, 2^16139972 is an apocalyptic number.

It is an amenable number.

16139972 is a deficient number, since it is larger than the sum of its proper divisors (12422968).

16139972 is a wasteful number, since it uses less digits than its factorization.

16139972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45430 (or 45428 counting only the distinct ones).

The product of its digits is 20412, while the sum is 38.

The square root of 16139972 is about 4017.4584005314. The cubic root of 16139972 is about 252.7168845294.

The spelling of 16139972 in words is "sixteen million, one hundred thirty-nine thousand, nine hundred seventy-two".