402351891 has 16 divisors (see below), whose sum is σ = 540447360. Its totient is φ = 266253120.

The previous prime is 402351853. The next prime is 402351893. The reversal of 402351891 is 198153204.

It is not a de Polignac number, because 402351891 - 2¹⁵ = 402319123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402351893) 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 15 ways as a sum of consecutive naturals, for example, 355815 + ... + 356943.

It is an arithmetic number, because the mean of its divisors is an integer number (33777960).

Almost surely, 2^402351891 is an apocalyptic number.

402351891 is a deficient number, since it is larger than the sum of its proper divisors (138095469).

402351891 is a wasteful number, since it uses less digits than its factorization.

402351891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 402351891 is about 20058.7111001679. The cubic root of 402351891 is about 738.2475521052.

The spelling of 402351891 in words is "four hundred two million, three hundred fifty-one thousand, eight hundred ninety-one".