402631634 has 4 divisors (see below), whose sum is σ = 603947454. Its totient is φ = 201315816.

The previous prime is 402631631. The next prime is 402631643. The reversal of 402631634 is 436136204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 330330625 + 72301009 = 18175^2 + 8503^2 .

It is a super-2 number, since 2×402631634² = 324224465395019912, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 402631597 and 402631606.

It is not an unprimeable number, because it can be changed into a prime (402631631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100657907 + ... + 100657910.

Almost surely, 2^402631634 is an apocalyptic number.

402631634 is a deficient number, since it is larger than the sum of its proper divisors (201315820).

402631634 is a wasteful number, since it uses less digits than its factorization.

402631634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201315819.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 402631634 is about 20065.6829936088. The cubic root of 402631634 is about 738.4186061384.

Adding to 402631634 its reverse (436136204), we get a palindrome (838767838).

The spelling of 402631634 in words is "four hundred two million, six hundred thirty-one thousand, six hundred thirty-four".