1377861397 has 8 divisors (see below), whose sum is σ = 1528598880. Its totient is φ = 1231370160.

The previous prime is 1377861379. The next prime is 1377861403. The reversal of 1377861397 is 7931687731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377861397 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 (1377861307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060878 + ... + 1062175.

It is an arithmetic number, because the mean of its divisors is an integer number (191074860).

Almost surely, 2^1377861397 is an apocalyptic number.

It is an amenable number.

1377861397 is a deficient number, since it is larger than the sum of its proper divisors (150737483).

1377861397 is a wasteful number, since it uses less digits than its factorization.

1377861397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123123.

The product of its digits is 1333584, while the sum is 52.

The square root of 1377861397 is about 37119.5554526182. Note that the first 3 decimals coincide. The cubic root of 1377861397 is about 1112.7608671928.

The spelling of 1377861397 in words is "one billion, three hundred seventy-seven million, eight hundred sixty-one thousand, three hundred ninety-seven".