1397772379 has 4 divisors (see below), whose sum is σ = 1397853184. Its totient is φ = 1397691576.

The previous prime is 1397772329. The next prime is 1397772401. The reversal of 1397772379 is 9732777931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1397772379 - 2²¹ = 1395675227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397772329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2772 + ... + 52945.

It is an arithmetic number, because the mean of its divisors is an integer number (349463296).

Almost surely, 2^1397772379 is an apocalyptic number.

1397772379 is a deficient number, since it is larger than the sum of its proper divisors (80805).

1397772379 is an equidigital number, since it uses as much as digits as its factorization.

1397772379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80804.

The product of its digits is 3500658, while the sum is 55.

The square root of 1397772379 is about 37386.7941792286. The cubic root of 1397772379 is about 1118.0952902054.

The spelling of 1397772379 in words is "one billion, three hundred ninety-seven million, seven hundred seventy-two thousand, three hundred seventy-nine".