1396804779 has 48 divisors (see below), whose sum is σ = 2285880480. Its totient is φ = 816583680.

The previous prime is 1396804777. The next prime is 1396804859. The reversal of 1396804779 is 9774086931.

It is a happy number.

1396804779 is a `hidden beast` number, since 1 + 3 + 96 + 80 + 477 + 9 = 666.

It is not a de Polignac number, because 1396804779 - 2¹ = 1396804777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1396804777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173389 + ... + 181265.

It is an arithmetic number, because the mean of its divisors is an integer number (47622510).

Almost surely, 2^1396804779 is an apocalyptic number.

1396804779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1396804779 is a deficient number, since it is larger than the sum of its proper divisors (889075701).

1396804779 is a wasteful number, since it uses less digits than its factorization.

1396804779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7980 (or 7977 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 1396804779 is about 37373.8515408835. The cubic root of 1396804779 is about 1117.8372322759.

The spelling of 1396804779 in words is "one billion, three hundred ninety-six million, eight hundred four thousand, seven hundred seventy-nine".