1396771979 has 8 divisors (see below), whose sum is σ = 1458968160. Its totient is φ = 1335511296.

The previous prime is 1396771973. The next prime is 1396772021. The reversal of 1396771979 is 9791776931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396771979 is a prime.

It is a super-2 number, since 2×1396771979² = 3901943922639152882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396771973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230822 + ... + 236795.

It is an arithmetic number, because the mean of its divisors is an integer number (182371020).

Almost surely, 2^1396771979 is an apocalyptic number.

1396771979 is a deficient number, since it is larger than the sum of its proper divisors (62196181).

1396771979 is a wasteful number, since it uses less digits than its factorization.

1396771979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467749.

The product of its digits is 4500846, while the sum is 59.

The square root of 1396771979 is about 37373.4127288371. The cubic root of 1396771979 is about 1117.8284824614.

The spelling of 1396771979 in words is "one billion, three hundred ninety-six million, seven hundred seventy-one thousand, nine hundred seventy-nine".