507890021 has 4 divisors (see below), whose sum is σ = 525403500. Its totient is φ = 490376544.

The previous prime is 507890017. The next prime is 507890059. The reversal of 507890021 is 120098705.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120098705 = 5 ⋅24019741.

It can be written as a sum of positive squares in 2 ways, for example, as 290327521 + 217562500 = 17039^2 + 14750^2 .

It is not a de Polignac number, because 507890021 - 2² = 507890017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 507890021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507890221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8756696 + ... + 8756753.

It is an arithmetic number, because the mean of its divisors is an integer number (131350875).

Almost surely, 2^507890021 is an apocalyptic number.

It is an amenable number.

507890021 is a deficient number, since it is larger than the sum of its proper divisors (17513479).

507890021 is a wasteful number, since it uses less digits than its factorization.

507890021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17513478.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 507890021 is about 22536.4154425676. The cubic root of 507890021 is about 797.8536324706.

The spelling of 507890021 in words is "five hundred seven million, eight hundred ninety thousand, twenty-one".