1391709725 has 12 divisors (see below), whose sum is σ = 1972251744. Its totient is φ = 954315120.

The previous prime is 1391709637. The next prime is 1391709727. The reversal of 1391709725 is 5279071931.

It is not a de Polignac number, because 1391709725 - 2²² = 1387515421 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 (1391709727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3976139 + ... + 3976488.

It is an arithmetic number, because the mean of its divisors is an integer number (164354312).

Almost surely, 2^1391709725 is an apocalyptic number.

It is an amenable number.

1391709725 is a deficient number, since it is larger than the sum of its proper divisors (580542019).

1391709725 is an equidigital number, since it uses as much as digits as its factorization.

1391709725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952644 (or 7952639 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1391709725 is about 37305.6259162073. The cubic root of 1391709725 is about 1116.4764169338.

The spelling of 1391709725 in words is "one billion, three hundred ninety-one million, seven hundred nine thousand, seven hundred twenty-five".