1399696660 has 24 divisors (see below), whose sum is σ = 3001904640. Its totient is φ = 547965984.

The previous prime is 1399696657. The next prime is 1399696709. The reversal of 1399696660 is 666969931.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743580 + ... + 745459.

It is an arithmetic number, because the mean of its divisors is an integer number (125079360).

Almost surely, 2^1399696660 is an apocalyptic number.

1399696660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399696660 is an abundant number, since it is smaller than the sum of its proper divisors (1602207980).

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

1399696660 is a wasteful number, since it uses less digits than its factorization.

1399696660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489095 (or 1489093 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 55.

The square root of 1399696660 is about 37412.5200968874. The cubic root of 1399696660 is about 1118.6081402682.

The spelling of 1399696660 in words is "one billion, three hundred ninety-nine million, six hundred ninety-six thousand, six hundred sixty".