1377891413 has 4 divisors (see below), whose sum is σ = 1425404940. Its totient is φ = 1330377888.

The previous prime is 1377891407. The next prime is 1377891421. The reversal of 1377891413 is 3141987731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3141987731 = 281 ⋅11181451.

It can be written as a sum of positive squares in 2 ways, for example, as 990864484 + 387026929 = 31478^2 + 19673^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377891413 - 2¹⁰ = 1377890389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377891443) 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, 23756720 + ... + 23756777.

It is an arithmetic number, because the mean of its divisors is an integer number (356351235).

Almost surely, 2^1377891413 is an apocalyptic number.

It is an amenable number.

1377891413 is a deficient number, since it is larger than the sum of its proper divisors (47513527).

1377891413 is an equidigital number, since it uses as much as digits as its factorization.

1377891413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47513526.

The product of its digits is 127008, while the sum is 44.

The square root of 1377891413 is about 37119.9597656032. The cubic root of 1377891413 is about 1112.7689474413.

The spelling of 1377891413 in words is "one billion, three hundred seventy-seven million, eight hundred ninety-one thousand, four hundred thirteen".