1399689890 has 16 divisors (see below), whose sum is σ = 2519888832. Its totient is φ = 559776624.

The previous prime is 1399689887. The next prime is 1399689899. The reversal of 1399689890 is 989869931.

1399689890 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1399689899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78377 + ... + 94563.

It is an arithmetic number, because the mean of its divisors is an integer number (157493052).

Almost surely, 2^1399689890 is an apocalyptic number.

1399689890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399689890 is a deficient number, since it is larger than the sum of its proper divisors (1120198942).

1399689890 is a wasteful number, since it uses less digits than its factorization.

1399689890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24841.

The product of its (nonzero) digits is 7558272, while the sum is 62.

The square root of 1399689890 is about 37412.4296190451. The cubic root of 1399689890 is about 1118.6063367848.

The spelling of 1399689890 in words is "one billion, three hundred ninety-nine million, six hundred eighty-nine thousand, eight hundred ninety".