1391873856 has 28 divisors (see below), whose sum is σ = 3682666752. Its totient is φ = 463957888.

The previous prime is 1391873809. The next prime is 1391873921. The reversal of 1391873856 is 6583781931.

It is a junction number, because it is equal to n+sod(n) for n = 1391873799 and 1391873808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624480 + ... + 3624863.

Almost surely, 2^1391873856 is an apocalyptic number.

1391873856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1391873856 is an abundant number, since it is smaller than the sum of its proper divisors (2290792896).

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

1391873856 is an equidigital number, since it uses as much as digits as its factorization.

1391873856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249358 (or 7249348 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 1391873856 is about 37307.8256670099. The cubic root of 1391873856 is about 1116.5203056806.

The spelling of 1391873856 in words is "one billion, three hundred ninety-one million, eight hundred seventy-three thousand, eight hundred fifty-six".