402640612 has 24 divisors (see below), whose sum is σ = 770011200. Its totient is φ = 182700960.

The previous prime is 402640577. The next prime is 402640613. The reversal of 402640612 is 216046204.

It is not an unprimeable number, because it can be changed into a prime (402640613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18718 + ... + 33994.

It is an arithmetic number, because the mean of its divisors is an integer number (32083800).

Almost surely, 2^402640612 is an apocalyptic number.

It is an amenable number.

402640612 is a deficient number, since it is larger than the sum of its proper divisors (367370588).

402640612 is a wasteful number, since it uses less digits than its factorization.

402640612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15891 (or 15889 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 402640612 is about 20065.9067076472. The cubic root of 402640612 is about 738.4240945903.

Adding to 402640612 its reverse (216046204), we get a palindrome (618686816).

The spelling of 402640612 in words is "four hundred two million, six hundred forty thousand, six hundred twelve".