402376021 has 8 divisors (see below), whose sum is σ = 407776824. Its totient is φ = 397003200.

The previous prime is 402375991. The next prime is 402376027. The reversal of 402376021 is 120673204.

It can be written as a sum of positive squares in 4 ways, for example, as 175271121 + 227104900 = 13239^2 + 15070^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 402376021 - 2⁹ = 402375509 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 (402376027) 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, 22795 + ... + 36391.

It is an arithmetic number, because the mean of its divisors is an integer number (50972103).

Almost surely, 2^402376021 is an apocalyptic number.

It is an amenable number.

402376021 is a deficient number, since it is larger than the sum of its proper divisors (5400803).

402376021 is a wasteful number, since it uses less digits than its factorization.

402376021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13991.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 402376021 is about 20059.3125754598. The cubic root of 402376021 is about 738.2623099641.

The spelling of 402376021 in words is "four hundred two million, three hundred seventy-six thousand, twenty-one".