402421501 has 24 divisors (see below), whose sum is σ = 469416384. Its totient is φ = 343094400.

The previous prime is 402421457. The next prime is 402421507. The reversal of 402421501 is 105124204.

It is not a de Polignac number, because 402421501 - 2⁹ = 402420989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402421507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139726 + ... + 142576.

It is an arithmetic number, because the mean of its divisors is an integer number (19559016).

Almost surely, 2^402421501 is an apocalyptic number.

It is an amenable number.

402421501 is a deficient number, since it is larger than the sum of its proper divisors (66994883).

402421501 is a wasteful number, since it uses less digits than its factorization.

402421501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929 (or 2910 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 402421501 is about 20060.4461814786. The cubic root of 402421501 is about 738.2901238357.

Adding to 402421501 its reverse (105124204), we get a palindrome (507545705).

The spelling of 402421501 in words is "four hundred two million, four hundred twenty-one thousand, five hundred one".