1497907857 has 4 divisors (see below), whose sum is σ = 1997210480. Its totient is φ = 998605236.

The previous prime is 1497907843. The next prime is 1497907891. The reversal of 1497907857 is 7587097941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1497907857 - 2⁶ = 1497907793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1497907797 and 1497907806.

It is not an unprimeable number, because it can be changed into a prime (1497907057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249651307 + ... + 249651312.

It is an arithmetic number, because the mean of its divisors is an integer number (499302620).

Almost surely, 2^1497907857 is an apocalyptic number.

It is an amenable number.

1497907857 is a deficient number, since it is larger than the sum of its proper divisors (499302623).

1497907857 is an equidigital number, since it uses as much as digits as its factorization.

1497907857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499302622.

The product of its (nonzero) digits is 4445280, while the sum is 57.

The square root of 1497907857 is about 38702.8145875723. The cubic root of 1497907857 is about 1144.1817936212.

The spelling of 1497907857 in words is "one billion, four hundred ninety-seven million, nine hundred seven thousand, eight hundred fifty-seven".