1377640993 has 4 divisors (see below), whose sum is σ = 1377762480. Its totient is φ = 1377519508.

The previous prime is 1377640991. The next prime is 1377641011. The reversal of 1377640993 is 3990467731.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1377640993 - 2¹ = 1377640991 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1377640991) 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 3 ways as a sum of consecutive naturals, for example, 41755 + ... + 67072.

It is an arithmetic number, because the mean of its divisors is an integer number (344440620).

Almost surely, 2^1377640993 is an apocalyptic number.

It is an amenable number.

1377640993 is a deficient number, since it is larger than the sum of its proper divisors (121487).

1377640993 is a wasteful number, since it uses less digits than its factorization.

1377640993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121486.

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

The square root of 1377640993 is about 37116.5864944502. The cubic root of 1377640993 is about 1112.7015312719.

The spelling of 1377640993 in words is "one billion, three hundred seventy-seven million, six hundred forty thousand, nine hundred ninety-three".