421312392 has 108 divisors (see below), whose sum is σ = 1189722885. Its totient is φ = 134689920.

The previous prime is 421312387. The next prime is 421312417. The reversal of 421312392 is 293213124.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

421312392 is a `hidden beast` number, since 421 + 3 + 1 + 239 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 300883716 + 120428676 = 17346^2 + 10974^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14514.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7140859 + ... + 7140917.

Almost surely, 2^421312392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421312392

421312392 is an abundant number, since it is smaller than the sum of its proper divisors (768410493).

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

421312392 is a wasteful number, since it uses less digits than its factorization.

421312392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 105 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 421312392 is about 20525.8956442831. The cubic root of 421312392 is about 749.6664543517. Note that the first 3 decimals are identical.

Multiplying 421312392 by its product of digits (2592), we get a square (1092041720064 = 1045008²).

The spelling of 421312392 in words is "four hundred twenty-one million, three hundred twelve thousand, three hundred ninety-two".