1402865639 has 12 divisors (see below), whose sum is σ = 1662698664. Its totient is φ = 1179766224.

The previous prime is 1402865609. The next prime is 1402865663. The reversal of 1402865639 is 9365682041.

It is not a de Polignac number, because 1402865639 - 2⁸ = 1402865383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1402865639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1402865609) 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, 267497 + ... + 272690.

It is an arithmetic number, because the mean of its divisors is an integer number (138558222).

Almost surely, 2^1402865639 is an apocalyptic number.

1402865639 is a deficient number, since it is larger than the sum of its proper divisors (259833025).

1402865639 is an equidigital number, since it uses as much as digits as its factorization.

1402865639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540254 (or 540247 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 1402865639 is about 37454.8480039634. The cubic root of 1402865639 is about 1119.4516977652.

The spelling of 1402865639 in words is "one billion, four hundred two million, eight hundred sixty-five thousand, six hundred thirty-nine".