402051621 has 8 divisors (see below), whose sum is σ = 554554080. Its totient is φ = 258791792.

The previous prime is 402051613. The next prime is 402051631. The reversal of 402051621 is 126150204.

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 402051621 - 2³ = 402051613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402051631) 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 7 ways as a sum of consecutive naturals, for example, 2310555 + ... + 2310728.

It is an arithmetic number, because the mean of its divisors is an integer number (69319260).

Almost surely, 2^402051621 is an apocalyptic number.

It is an amenable number.

402051621 is a deficient number, since it is larger than the sum of its proper divisors (152502459).

402051621 is a wasteful number, since it uses less digits than its factorization.

402051621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4621315.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 402051621 is about 20051.2249251760. The cubic root of 402051621 is about 738.0638582091.

The spelling of 402051621 in words is "four hundred two million, fifty-one thousand, six hundred twenty-one".