13640990 has 32 divisors (see below), whose sum is σ = 26943840. Its totient is φ = 4931200.

The previous prime is 13640989. The next prime is 13641041. The reversal of 13640990 is 9904631.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29360 + ... + 29820.

It is an arithmetic number, because the mean of its divisors is an integer number (841995).

Almost surely, 2^13640990 is an apocalyptic number.

13640990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13640990 is a deficient number, since it is larger than the sum of its proper divisors (13302850).

13640990 is a wasteful number, since it uses less digits than its factorization.

13640990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 13640990 is about 3693.3710888564. The cubic root of 13640990 is about 238.9362060790.

The spelling of 13640990 in words is "thirteen million, six hundred forty thousand, nine hundred ninety".