1377421157 has 4 divisors (see below), whose sum is σ = 1574195616. Its totient is φ = 1180646700.

The previous prime is 1377421099. The next prime is 1377421181. The reversal of 1377421157 is 7511247731.

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 an emirpimes, since its reverse is a distinct semiprime: 7511247731 = 13 ⋅577788287.

It is a cyclic number.

It is not a de Polignac number, because 1377421157 - 2¹⁸ = 1377159013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377421157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377421757) 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, 98387219 + ... + 98387232.

It is an arithmetic number, because the mean of its divisors is an integer number (393548904).

Almost surely, 2^1377421157 is an apocalyptic number.

It is an amenable number.

1377421157 is a deficient number, since it is larger than the sum of its proper divisors (196774459).

1377421157 is an equidigital number, since it uses as much as digits as its factorization.

1377421157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196774458.

The product of its digits is 41160, while the sum is 38.

The square root of 1377421157 is about 37113.6249509530. The cubic root of 1377421157 is about 1112.6423419603.

Adding to 1377421157 its reverse (7511247731), we get a palindrome (8888668888).

The spelling of 1377421157 in words is "one billion, three hundred seventy-seven million, four hundred twenty-one thousand, one hundred fifty-seven".