40390402 has 16 divisors (see below), whose sum is σ = 69084792. Its totient is φ = 17544960.

The previous prime is 40390393. The next prime is 40390411. The reversal of 40390402 is 20409304.

It is an interprime number because it is at equal distance from previous prime (40390393) and next prime (40390411).

It can be written as a sum of positive squares in 4 ways, for example, as 37564641 + 2825761 = 6129^2 + 1681^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45249 + ... + 46132.

Almost surely, 2^40390402 is an apocalyptic number.

40390402 is a deficient number, since it is larger than the sum of its proper divisors (28694390).

40390402 is a wasteful number, since it uses less digits than its factorization.

40390402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91413.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40390402 is about 6355.3443651780. The cubic root of 40390402 is about 343.1042191101.

Adding to 40390402 its reverse (20409304), we get a palindrome (60799706).

The spelling of 40390402 in words is "forty million, three hundred ninety thousand, four hundred two".