402626021 has 4 divisors (see below), whose sum is σ = 460144032. Its totient is φ = 345108012.

The previous prime is 402626009. The next prime is 402626023. The reversal of 402626021 is 120626204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402626021 - 2¹⁰ = 402624997 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 (402626023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28758995 + ... + 28759008.

It is an arithmetic number, because the mean of its divisors is an integer number (115036008).

Almost surely, 2^402626021 is an apocalyptic number.

It is an amenable number.

402626021 is a deficient number, since it is larger than the sum of its proper divisors (57518011).

402626021 is an equidigital number, since it uses as much as digits as its factorization.

402626021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57518010.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 402626021 is about 20065.5431274611. The cubic root of 402626021 is about 738.4151747448.

The spelling of 402626021 in words is "four hundred two million, six hundred twenty-six thousand, twenty-one".