402072891 has 8 divisors (see below), whose sum is σ = 584833344. Its totient is φ = 243680520.

The previous prime is 402072887. The next prime is 402072901. The reversal of 402072891 is 198270204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402072891 - 2² = 402072887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 12184027 = 402072891 / (4 + 0 + 2 + 0 + 7 + 2 + 8 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (402072841) 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, 6091981 + ... + 6092046.

It is an arithmetic number, because the mean of its divisors is an integer number (73104168).

Almost surely, 2^402072891 is an apocalyptic number.

402072891 is a deficient number, since it is larger than the sum of its proper divisors (182760453).

402072891 is a wasteful number, since it uses less digits than its factorization.

402072891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12184041.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 402072891 is about 20051.7553096980. The cubic root of 402072891 is about 738.0768734047.

The spelling of 402072891 in words is "four hundred two million, seventy-two thousand, eight hundred ninety-one".