1399921281 has 24 divisors (see below), whose sum is σ = 2277100800. Its totient is φ = 821066400.

The previous prime is 1399921267. The next prime is 1399921283. The reversal of 1399921281 is 1821299931.

It is not a de Polignac number, because 1399921281 - 2⁶ = 1399921217 is a prime.

It is a super-2 number, since 2×1399921281² = 3919559185993361922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1399921283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225006 + ... + 231143.

It is an arithmetic number, because the mean of its divisors is an integer number (94879200).

Almost surely, 2^1399921281 is an apocalyptic number.

1399921281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1399921281 is a deficient number, since it is larger than the sum of its proper divisors (877179519).

1399921281 is a wasteful number, since it uses less digits than its factorization.

1399921281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456197 (or 456194 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1399921281 is about 37415.5219260670. The cubic root of 1399921281 is about 1118.6679745277.

The spelling of 1399921281 in words is "one billion, three hundred ninety-nine million, nine hundred twenty-one thousand, two hundred eighty-one".