1376991 has 24 divisors (see below), whose sum is σ = 2481024. Its totient is φ = 714960.

The previous prime is 1376981. The next prime is 1377023. The reversal of 1376991 is 1996731.

It is not a de Polignac number, because 1376991 - 2¹⁴ = 1360607 is a prime.

It is a super-2 number, since 2×1376991² = 3792208428162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1376971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (103376).

2^1376991 is an apocalyptic number.

1376991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1376991 is a deficient number, since it is larger than the sum of its proper divisors (1104033).

1376991 is a wasteful number, since it uses less digits than its factorization.

1376991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 2008 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 1376991 is about 1173.4525981053. The cubic root of 1376991 is about 111.2526506964.

The spelling of 1376991 in words is "one million, three hundred seventy-six thousand, nine hundred ninety-one".