1399873520 has 40 divisors (see below), whose sum is σ = 3259639584. Its totient is φ = 559100672.

The previous prime is 1399873513. The next prime is 1399873523. The reversal of 1399873520 is 253789931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399873523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41237 + ... + 67083.

Almost surely, 2^1399873520 is an apocalyptic number.

1399873520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399873520 is an abundant number, since it is smaller than the sum of its proper divisors (1859766064).

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

1399873520 is a wasteful number, since it uses less digits than its factorization.

1399873520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26537 (or 26531 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1399873520 is about 37414.8836694704. The cubic root of 1399873520 is about 1118.6552525484.

The spelling of 1399873520 in words is "one billion, three hundred ninety-nine million, eight hundred seventy-three thousand, five hundred twenty".