402240621 has 16 divisors (see below), whose sum is σ = 597758400. Its totient is φ = 239102208.

The previous prime is 402240613. The next prime is 402240637. The reversal of 402240621 is 126042204.

It is not a de Polignac number, because 402240621 - 2³ = 402240613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402240821) 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 15 ways as a sum of consecutive naturals, for example, 206586 + ... + 208523.

It is an arithmetic number, because the mean of its divisors is an integer number (37359900).

Almost surely, 2^402240621 is an apocalyptic number.

It is an amenable number.

402240621 is a deficient number, since it is larger than the sum of its proper divisors (195517779).

402240621 is a wasteful number, since it uses less digits than its factorization.

402240621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415148.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 402240621 is about 20055.9373004604. The cubic root of 402240621 is about 738.1794919648.

Adding to 402240621 its reverse (126042204), we get a palindrome (528282825).

The spelling of 402240621 in words is "four hundred two million, two hundred forty thousand, six hundred twenty-one".