1390252639 has 8 divisors (see below), whose sum is σ = 1472655600. Its totient is φ = 1307918976.

The previous prime is 1390252637. The next prime is 1390252681. The reversal of 1390252639 is 9362520931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1390252639 - 2¹ = 1390252637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390252637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27292 + ... + 59374.

It is an arithmetic number, because the mean of its divisors is an integer number (184081950).

Almost surely, 2^1390252639 is an apocalyptic number.

1390252639 is a deficient number, since it is larger than the sum of its proper divisors (82402961).

1390252639 is a wasteful number, since it uses less digits than its factorization.

1390252639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34649.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 1390252639 is about 37286.0917635517. The cubic root of 1390252639 is about 1116.0866397174.

The spelling of 1390252639 in words is "one billion, three hundred ninety million, two hundred fifty-two thousand, six hundred thirty-nine".