402121143 has 24 divisors (see below), whose sum is σ = 609256128. Its totient is φ = 255275712.

The previous prime is 402121133. The next prime is 402121147. The reversal of 402121143 is 341121204.

402121143 is a `hidden beast` number, since 402 + 121 + 143 = 666.

It is not a de Polignac number, because 402121143 - 2²² = 397926839 is a prime.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2805 + ... + 28497.

It is an arithmetic number, because the mean of its divisors is an integer number (25385672).

Almost surely, 2^402121143 is an apocalyptic number.

402121143 is a deficient number, since it is larger than the sum of its proper divisors (207134985).

402121143 is a wasteful number, since it uses less digits than its factorization.

402121143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25783 (or 25780 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 402121143 is about 20052.9584600378. The cubic root of 402121143 is about 738.1063972892.

Adding to 402121143 its reverse (341121204), we get a palindrome (743242347).

The spelling of 402121143 in words is "four hundred two million, one hundred twenty-one thousand, one hundred forty-three".