1377440381 has 2 divisors, whose sum is σ = 1377440382. Its totient is φ = 1377440380.

The previous prime is 1377440299. The next prime is 1377440401. The reversal of 1377440381 is 1830447731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1272705625 + 104734756 = 35675^2 + 10234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377440381 - 2¹⁸ = 1377178237 is a prime.

It is a super-2 number, since 2×1377440381² = 3794684006418850322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377440681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688720190 + 688720191.

It is an arithmetic number, because the mean of its divisors is an integer number (688720191).

Almost surely, 2^1377440381 is an apocalyptic number.

It is an amenable number.

1377440381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377440381 is an equidigital number, since it uses as much as digits as its factorization.

1377440381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1377440381 is about 37113.8839384940. The cubic root of 1377440381 is about 1112.6475181396.

The spelling of 1377440381 in words is "one billion, three hundred seventy-seven million, four hundred forty thousand, three hundred eighty-one".