402421387 has 4 divisors (see below), whose sum is σ = 423601480. Its totient is φ = 381241296.

The previous prime is 402421381. The next prime is 402421457. The reversal of 402421387 is 783124204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402421387 - 2⁷ = 402421259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402421381) 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 3 ways as a sum of consecutive naturals, for example, 10590018 + ... + 10590055.

It is an arithmetic number, because the mean of its divisors is an integer number (105900370).

Almost surely, 2^402421387 is an apocalyptic number.

402421387 is a deficient number, since it is larger than the sum of its proper divisors (21180093).

402421387 is a wasteful number, since it uses less digits than its factorization.

402421387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21180092.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 402421387 is about 20060.4433400660. The cubic root of 402421387 is about 738.2900541202.

The spelling of 402421387 in words is "four hundred two million, four hundred twenty-one thousand, three hundred eighty-seven".