1391338725 has 24 divisors (see below), whose sum is σ = 2628968640. Its totient is φ = 636040320.

The previous prime is 1391338723. The next prime is 1391338801. The reversal of 1391338725 is 5278331931.

It is not a de Polignac number, because 1391338725 - 2¹ = 1391338723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391338723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1324560 + ... + 1325609.

It is an arithmetic number, because the mean of its divisors is an integer number (109540360).

Almost surely, 2^1391338725 is an apocalyptic number.

1391338725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1391338725 is a deficient number, since it is larger than the sum of its proper divisors (1237629915).

1391338725 is a wasteful number, since it uses less digits than its factorization.

1391338725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650189 (or 2650184 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 1391338725 is about 37300.6531444156. The cubic root of 1391338725 is about 1116.3771985514.

The spelling of 1391338725 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred twenty-five".