1399957720 has 32 divisors (see below), whose sum is σ = 3599892000. Its totient is φ = 479985408.

The previous prime is 1399957717. The next prime is 1399957759. The reversal of 1399957720 is 277599931.

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, 2499645 + ... + 2500204.

It is an arithmetic number, because the mean of its divisors is an integer number (112496625).

Almost surely, 2^1399957720 is an apocalyptic number.

1399957720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399957720 is an abundant number, since it is smaller than the sum of its proper divisors (2199934280).

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

1399957720 is a wasteful number, since it uses less digits than its factorization.

1399957720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999867 (or 4999863 counting only the distinct ones).

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 1399957720 is about 37416.0088732083. The cubic root of 1399957720 is about 1118.6776804993.

The spelling of 1399957720 in words is "one billion, three hundred ninety-nine million, nine hundred fifty-seven thousand, seven hundred twenty".