1390665312 has 72 divisors (see below), whose sum is σ = 4019586480. Its totient is φ = 455950080.

The previous prime is 1390665277. The next prime is 1390665323. The reversal of 1390665312 is 2135660931.

1390665312 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22012 + ... + 57147.

It is an arithmetic number, because the mean of its divisors is an integer number (55827590).

Almost surely, 2^1390665312 is an apocalyptic number.

1390665312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1390665312 is an abundant number, since it is smaller than the sum of its proper divisors (2628921168).

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

1390665312 is a wasteful number, since it uses less digits than its factorization.

1390665312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79236 (or 79225 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 1390665312 is about 37291.6252260477. The cubic root of 1390665312 is about 1116.1970592783.

The spelling of 1390665312 in words is "one billion, three hundred ninety million, six hundred sixty-five thousand, three hundred twelve".