1319991672 has 32 divisors (see below), whose sum is σ = 3346462080. Its totient is φ = 433799520.

The previous prime is 1319991661. The next prime is 1319991691. The reversal of 1319991672 is 2761999131.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385618 + ... + 389025.

It is an arithmetic number, because the mean of its divisors is an integer number (104576940).

Almost surely, 2^1319991672 is an apocalyptic number.

1319991672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1319991672 is an abundant number, since it is smaller than the sum of its proper divisors (2026470408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1319991672 is a wasteful number, since it uses less digits than its factorization.

1319991672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774723 (or 774719 counting only the distinct ones).

The product of its digits is 183708, while the sum is 48.

The square root of 1319991672 is about 36331.6896386612. The cubic root of 1319991672 is about 1096.9590035388.

The spelling of 1319991672 in words is "one billion, three hundred nineteen million, nine hundred ninety-one thousand, six hundred seventy-two".