402121340 has 24 divisors (see below), whose sum is σ = 844839072. Its totient is φ = 160775360.

The previous prime is 402121319. The next prime is 402121361. The reversal of 402121340 is 43121204.

It is an interprime number because it is at equal distance from previous prime (402121319) and next prime (402121361).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70682 + ... + 76158.

It is an arithmetic number, because the mean of its divisors is an integer number (35201628).

Almost surely, 2^402121340 is an apocalyptic number.

It is an amenable number.

402121340 is an abundant number, since it is smaller than the sum of its proper divisors (442717732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402121340 is a wasteful number, since it uses less digits than its factorization.

402121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157 (or 9155 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402121340 is about 20052.9633720306. The cubic root of 402121340 is about 738.1065178224.

Adding to 402121340 its reverse (43121204), we get a palindrome (445242544).

The spelling of 402121340 in words is "four hundred two million, one hundred twenty-one thousand, three hundred forty".