402440139 has 12 divisors (see below), whose sum is σ = 594821656. Its totient is φ = 262053792.

The previous prime is 402440113. The next prime is 402440147. The reversal of 402440139 is 931044204.

It is not a de Polignac number, because 402440139 - 2¹⁶ = 402374603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402440189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519562 + ... + 520335.

Almost surely, 2^402440139 is an apocalyptic number.

402440139 is a deficient number, since it is larger than the sum of its proper divisors (192381517).

402440139 is a wasteful number, since it uses less digits than its factorization.

402440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039946 (or 1039943 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 402440139 is about 20060.9107220983. The cubic root of 402440139 is about 738.3015215359.

The spelling of 402440139 in words is "four hundred two million, four hundred forty thousand, one hundred thirty-nine".