507398991 has 16 divisors (see below), whose sum is σ = 740771328. Its totient is φ = 306374400.

The previous prime is 507398989. The next prime is 507398999. The reversal of 507398991 is 199893705.

It is a happy number.

It is not a de Polignac number, because 507398991 - 2¹ = 507398989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507398999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19426 + ... + 37311.

It is an arithmetic number, because the mean of its divisors is an integer number (46298208).

Almost surely, 2^507398991 is an apocalyptic number.

507398991 is a deficient number, since it is larger than the sum of its proper divisors (233372337).

507398991 is a wasteful number, since it uses less digits than its factorization.

507398991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57022.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 507398991 is about 22525.5186621751. The cubic root of 507398991 is about 797.5964269236.

The spelling of 507398991 in words is "five hundred seven million, three hundred ninety-eight thousand, nine hundred ninety-one".