402444631 has 4 divisors (see below), whose sum is σ = 404668264. Its totient is φ = 400221000.

The previous prime is 402444607. The next prime is 402444649. The reversal of 402444631 is 136444204.

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

It is a cyclic number.

It is not a de Polignac number, because 402444631 - 2⁵ = 402444599 is a prime.

It is a super-2 number, since 2×402444631² = 323923362041452322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402444631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402444661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111545 + ... + 1111906.

It is an arithmetic number, because the mean of its divisors is an integer number (101167066).

Almost surely, 2^402444631 is an apocalyptic number.

402444631 is a deficient number, since it is larger than the sum of its proper divisors (2223633).

402444631 is a wasteful number, since it uses less digits than its factorization.

402444631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223632.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 402444631 is about 20061.0226808107. The cubic root of 402444631 is about 738.3042684771.

Adding to 402444631 its reverse (136444204), we get a palindrome (538888835).

The spelling of 402444631 in words is "four hundred two million, four hundred forty-four thousand, six hundred thirty-one".