1349890857 has 72 divisors (see below), whose sum is σ = 2318677920. Its totient is φ = 754427520.

The previous prime is 1349890849. The next prime is 1349890879. The reversal of 1349890857 is 7580989431.

1349890857 is a `hidden beast` number, since 13 + 498 + 90 + 8 + 57 = 666.

It is not a de Polignac number, because 1349890857 - 2³ = 1349890849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1349810857) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6397482 + ... + 6397692.

It is an arithmetic number, because the mean of its divisors is an integer number (32203860).

Almost surely, 2^1349890857 is an apocalyptic number.

It is an amenable number.

1349890857 is a deficient number, since it is larger than the sum of its proper divisors (968787063).

1349890857 is a wasteful number, since it uses less digits than its factorization.

1349890857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 1349890857 is about 36740.8608636216. The cubic root of 1349890857 is about 1105.1796646228.

The spelling of 1349890857 in words is "one billion, three hundred forty-nine million, eight hundred ninety thousand, eight hundred fifty-seven".