1399928540 has 24 divisors (see below), whose sum is σ = 2940553392. Its totient is φ = 559837440.

The previous prime is 1399928533. The next prime is 1399928549. The reversal of 1399928540 is 458299931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399928549) 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, 155975 + ... + 164705.

It is an arithmetic number, because the mean of its divisors is an integer number (122523058).

Almost surely, 2^1399928540 is an apocalyptic number.

1399928540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399928540 is an abundant number, since it is smaller than the sum of its proper divisors (1540624852).

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

1399928540 is a wasteful number, since it uses less digits than its factorization.

1399928540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16757 (or 16755 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1399928540 is about 37415.6189311362. The cubic root of 1399928540 is about 1118.6699080643.

The spelling of 1399928540 in words is "one billion, three hundred ninety-nine million, nine hundred twenty-eight thousand, five hundred forty".