1377481725 has 36 divisors (see below), whose sum is σ = 2477153952. Its totient is φ = 731700000.

The previous prime is 1377481681. The next prime is 1377481793. The reversal of 1377481725 is 5271847731.

It is not a de Polignac number, because 1377481725 - 2²¹ = 1375384573 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44280 + ... + 68670.

It is an arithmetic number, because the mean of its divisors is an integer number (68809832).

Almost surely, 2^1377481725 is an apocalyptic number.

1377481725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1377481725 is a deficient number, since it is larger than the sum of its proper divisors (1099672227).

1377481725 is a wasteful number, since it uses less digits than its factorization.

1377481725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24658 (or 24650 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 1377481725 is about 37114.4409226382. The cubic root of 1377481725 is about 1112.6586501008.

The spelling of 1377481725 in words is "one billion, three hundred seventy-seven million, four hundred eighty-one thousand, seven hundred twenty-five".