632390021 has 8 divisors (see below), whose sum is σ = 678763224. Its totient is φ = 587036160.

The previous prime is 632389997. The next prime is 632390047. The reversal of 632390021 is 120093236.

It can be written as a sum of positive squares in 4 ways, for example, as 59505796 + 572884225 = 7714^2 + 23935^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-632390021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (632390921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253550 + ... + 256031.

It is an arithmetic number, because the mean of its divisors is an integer number (84845403).

Almost surely, 2^632390021 is an apocalyptic number.

It is an amenable number.

632390021 is a deficient number, since it is larger than the sum of its proper divisors (46373203).

632390021 is a wasteful number, since it uses less digits than its factorization.

632390021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509671.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 632390021 is about 25147.3660847414. The cubic root of 632390021 is about 858.3445805252.

The spelling of 632390021 in words is "six hundred thirty-two million, three hundred ninety thousand, twenty-one".