1390051644 has 48 divisors (see below), whose sum is σ = 3394406400. Its totient is φ = 441904320.

The previous prime is 1390051639. The next prime is 1390051651. The reversal of 1390051644 is 4461500931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89109 + ... + 103539.

It is an arithmetic number, because the mean of its divisors is an integer number (70716800).

Almost surely, 2^1390051644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390051644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697203200).

1390051644 is an abundant number, since it is smaller than the sum of its proper divisors (2004354756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390051644 is a wasteful number, since it uses less digits than its factorization.

1390051644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14810 (or 14808 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1390051644 is about 37283.3963581646. The cubic root of 1390051644 is about 1116.0328512574.

The spelling of 1390051644 in words is "one billion, three hundred ninety million, fifty-one thousand, six hundred forty-four".