1377247725 has 48 divisors (see below), whose sum is σ = 2891501440. Its totient is φ = 629596800.

The previous prime is 1377247717. The next prime is 1377247727. The reversal of 1377247725 is 5277427731.

It is not a de Polignac number, because 1377247725 - 2³ = 1377247717 is a prime.

It is a super-2 number, since 2×1377247725² = 3793622592035351250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377247727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141016 + ... + 150465.

Almost surely, 2^1377247725 is an apocalyptic number.

1377247725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1377247725 is an abundant number, since it is smaller than the sum of its proper divisors (1514253715).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1377247725 is a wasteful number, since it uses less digits than its factorization.

1377247725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291507 (or 291496 counting only the distinct ones).

The product of its digits is 576240, while the sum is 45.

The square root of 1377247725 is about 37111.2883769885. The cubic root of 1377247725 is about 1112.5956421582.

The spelling of 1377247725 in words is "one billion, three hundred seventy-seven million, two hundred forty-seven thousand, seven hundred twenty-five".