1377967957 has 4 divisors (see below), whose sum is σ = 1378043296. Its totient is φ = 1377892620.

The previous prime is 1377967937. The next prime is 1377967967. The reversal of 1377967957 is 7597697731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377967957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1377967895 and 1377967904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377967937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9232 + ... + 53302.

It is an arithmetic number, because the mean of its divisors is an integer number (344510824).

Almost surely, 2^1377967957 is an apocalyptic number.

It is an amenable number.

1377967957 is a deficient number, since it is larger than the sum of its proper divisors (75339).

1377967957 is an equidigital number, since it uses as much as digits as its factorization.

1377967957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75338.

The product of its digits is 17503290, while the sum is 61.

The square root of 1377967957 is about 37120.9907868850. The cubic root of 1377967957 is about 1112.7895524054.

The spelling of 1377967957 in words is "one billion, three hundred seventy-seven million, nine hundred sixty-seven thousand, nine hundred fifty-seven".