16139425 has 6 divisors (see below), whose sum is σ = 20012918. Its totient is φ = 12911520.

The previous prime is 16139423. The next prime is 16139447. The reversal of 16139425 is 52493161.

It can be written as a sum of positive squares in 3 ways, for example, as 3136 + 16136289 = 56^2 + 4017^2 .

It is not a de Polignac number, because 16139425 - 2¹ = 16139423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16139423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 322764 + ... + 322813.

Almost surely, 2^16139425 is an apocalyptic number.

It is an amenable number.

16139425 is a deficient number, since it is larger than the sum of its proper divisors (3873493).

16139425 is an equidigital number, since it uses as much as digits as its factorization.

16139425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645587 (or 645582 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 16139425 is about 4017.3903220872. The cubic root of 16139425 is about 252.7140295534.

The spelling of 16139425 in words is "sixteen million, one hundred thirty-nine thousand, four hundred twenty-five".