1390305725 has 12 divisors (see below), whose sum is σ = 1798935456. Its totient is φ = 1063885680.

The previous prime is 1390305689. The next prime is 1390305727. The reversal of 1390305725 is 5275030931.

It is a happy number.

It is not a de Polignac number, because 1390305725 - 2¹² = 1390301629 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 (1390305727) 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, 1208387 + ... + 1209536.

It is an arithmetic number, because the mean of its divisors is an integer number (149911288).

Almost surely, 2^1390305725 is an apocalyptic number.

It is an amenable number.

1390305725 is a deficient number, since it is larger than the sum of its proper divisors (408629731).

1390305725 is a wasteful number, since it uses less digits than its factorization.

1390305725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417956 (or 2417951 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 1390305725 is about 37286.8036307753. The cubic root of 1390305725 is about 1116.1008452461.

The spelling of 1390305725 in words is "one billion, three hundred ninety million, three hundred five thousand, seven hundred twenty-five".