402165823 has 4 divisors (see below), whose sum is σ = 416033640. Its totient is φ = 388298008.

The previous prime is 402165817. The next prime is 402165851. The reversal of 402165823 is 328561204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402165823 - 2⁵ = 402165791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402165523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6933865 + ... + 6933922.

It is an arithmetic number, because the mean of its divisors is an integer number (104008410).

Almost surely, 2^402165823 is an apocalyptic number.

402165823 is a deficient number, since it is larger than the sum of its proper divisors (13867817).

402165823 is a wasteful number, since it uses less digits than its factorization.

402165823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13867816.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 402165823 is about 20054.0724791749. The cubic root of 402165823 is about 738.1337334730.

The spelling of 402165823 in words is "four hundred two million, one hundred sixty-five thousand, eight hundred twenty-three".