402551630 has 16 divisors (see below), whose sum is σ = 780331104. Its totient is φ = 148634400.

The previous prime is 402551609. The next prime is 402551659. The reversal of 402551630 is 36155204.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 402551630.

It is a congruent number.

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, 1548146 + ... + 1548405.

It is an arithmetic number, because the mean of its divisors is an integer number (48770694).

Almost surely, 2^402551630 is an apocalyptic number.

402551630 is a deficient number, since it is larger than the sum of its proper divisors (377779474).

402551630 is a wasteful number, since it uses less digits than its factorization.

402551630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096571.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 402551630 is about 20063.6893416939. The cubic root of 402551630 is about 738.3696943040.

It can be divided in two parts, 4025 and 51630, that added together give a palindrome (55655).

The spelling of 402551630 in words is "four hundred two million, five hundred fifty-one thousand, six hundred thirty".