13891990 has 24 divisors (see below), whose sum is σ = 29089152. Its totient is φ = 4762800.

The previous prime is 13891987. The next prime is 13891993. The reversal of 13891990 is 9919831.

It is an interprime number because it is at equal distance from previous prime (13891987) and next prime (13891993).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13686 + ... + 14665.

It is an arithmetic number, because the mean of its divisors is an integer number (1212048).

Almost surely, 2^13891990 is an apocalyptic number.

13891990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13891990 is an abundant number, since it is smaller than the sum of its proper divisors (15197162).

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

13891990 is a wasteful number, since it uses less digits than its factorization.

13891990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28372 (or 28365 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 13891990 is about 3727.1959969929. The cubic root of 13891990 is about 240.3928173579.

The spelling of 13891990 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred ninety".