1377640399 has 4 divisors (see below), whose sum is σ = 1398202264. Its totient is φ = 1357078536.

The previous prime is 1377640379. The next prime is 1377640421. The reversal of 1377640399 is 9930467731.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1377640399 - 2¹⁷ = 1377509327 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 (1377640379) 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, 10280832 + ... + 10280965.

It is an arithmetic number, because the mean of its divisors is an integer number (349550566).

Almost surely, 2^1377640399 is an apocalyptic number.

1377640399 is a deficient number, since it is larger than the sum of its proper divisors (20561865).

1377640399 is an equidigital number, since it uses as much as digits as its factorization.

1377640399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20561864.

The product of its (nonzero) digits is 857304, while the sum is 49.

The square root of 1377640399 is about 37116.5784926359. The cubic root of 1377640399 is about 1112.7013713500.

The spelling of 1377640399 in words is "one billion, three hundred seventy-seven million, six hundred forty thousand, three hundred ninety-nine".