1390044864 has 112 divisors (see below), whose sum is σ = 4169338880. Its totient is φ = 405181440.

The previous prime is 1390044829. The next prime is 1390044869. The reversal of 1390044864 is 4684400931.

It is a happy number.

It is a super-3 number, since 3×1390044864³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1390044869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32769 + ... + 62079.

It is an arithmetic number, because the mean of its divisors is an integer number (37226240).

Almost surely, 2^1390044864 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 1390044864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2084669440).

1390044864 is an abundant number, since it is smaller than the sum of its proper divisors (2779294016).

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

1390044864 is a wasteful number, since it uses less digits than its factorization.

1390044864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29358 (or 29348 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 1390044864 is about 37283.3054328610. The cubic root of 1390044864 is about 1116.0310367648.

The spelling of 1390044864 in words is "one billion, three hundred ninety million, forty-four thousand, eight hundred sixty-four".