402121144 has 32 divisors (see below), whose sum is σ = 788538240. Its totient is φ = 191884000.

The previous prime is 402121133. The next prime is 402121147. The reversal of 402121144 is 441121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402121147) 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 7 ways as a sum of consecutive naturals, for example, 88119 + ... + 92569.

It is an arithmetic number, because the mean of its divisors is an integer number (24641820).

Almost surely, 2^402121144 is an apocalyptic number.

It is an amenable number.

402121144 is a deficient number, since it is larger than the sum of its proper divisors (386417096).

402121144 is a wasteful number, since it uses less digits than its factorization.

402121144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971 (or 4967 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 402121144 is about 20052.9584849717. The cubic root of 402121144 is about 738.1063979010.

Adding to 402121144 its reverse (441121204), we get a palindrome (843242348).

The spelling of 402121144 in words is "four hundred two million, one hundred twenty-one thousand, one hundred forty-four".