402420644 has 12 divisors (see below), whose sum is σ = 704791500. Its totient is φ = 201051648.

The previous prime is 402420643. The next prime is 402420647. The reversal of 402420644 is 446024204.

It can be written as a sum of positive squares in 2 ways, for example, as 210598144 + 191822500 = 14512^2 + 13850^2 .

It is not an unprimeable number, because it can be changed into a prime (402420643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33869 + ... + 44180.

It is an arithmetic number, because the mean of its divisors is an integer number (58732625).

Almost surely, 2^402420644 is an apocalyptic number.

It is an amenable number.

402420644 is a deficient number, since it is larger than the sum of its proper divisors (302370856).

402420644 is a wasteful number, since it uses less digits than its factorization.

402420644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79342 (or 79340 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 402420644 is about 20060.4248210251. The cubic root of 402420644 is about 738.2895997458.

Adding to 402420644 its reverse (446024204), we get a palindrome (848444848).

The spelling of 402420644 in words is "four hundred two million, four hundred twenty thousand, six hundred forty-four".