402131144 has 8 divisors (see below), whose sum is σ = 753995910. Its totient is φ = 201065568.

The previous prime is 402131129. The next prime is 402131153. The reversal of 402131144 is 441131204.

It can be written as a sum of positive squares in only one way, i.e., 393546244 + 8584900 = 19838^2 + 2930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25133189 + ... + 25133204.

Almost surely, 2^402131144 is an apocalyptic number.

It is an amenable number.

402131144 is a deficient number, since it is larger than the sum of its proper divisors (351864766).

402131144 is a wasteful number, since it uses less digits than its factorization.

402131144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50266399 (or 50266395 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 402131144 is about 20053.2078231888. The cubic root of 402131144 is about 738.1125162917.

Adding to 402131144 its reverse (441131204), we get a palindrome (843262348).

The spelling of 402131144 in words is "four hundred two million, one hundred thirty-one thousand, one hundred forty-four".