402171923 has 2 divisors, whose sum is σ = 402171924. Its totient is φ = 402171922.

The previous prime is 402171901. The next prime is 402171937. The reversal of 402171923 is 329171204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402171923 - 2²⁶ = 335063059 is a prime.

It is not a weakly prime, because it can be changed into another prime (402171943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201085961 + 201085962.

It is an arithmetic number, because the mean of its divisors is an integer number (201085962).

Almost surely, 2^402171923 is an apocalyptic number.

402171923 is a deficient number, since it is larger than the sum of its proper divisors (1).

402171923 is an equidigital number, since it uses as much as digits as its factorization.

402171923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 402171923 is about 20054.2245674072. The cubic root of 402171923 is about 738.1374654270.

The spelling of 402171923 in words is "four hundred two million, one hundred seventy-one thousand, nine hundred twenty-three".