13640690 has 16 divisors (see below), whose sum is σ = 28060992. Its totient is φ = 4676784.

The previous prime is 13640677. The next prime is 13640699. The reversal of 13640690 is 9604631.

It is a super-2 number, since 2×13640690² = 372136847352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13640699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97364 + ... + 97503.

It is an arithmetic number, because the mean of its divisors is an integer number (1753812).

Almost surely, 2^13640690 is an apocalyptic number.

13640690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13640690 is an abundant number, since it is smaller than the sum of its proper divisors (14420302).

13640690 is a wasteful number, since it uses less digits than its factorization.

13640690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194881.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 13640690 is about 3693.3304753298. The cubic root of 13640690 is about 238.9344544615.

The spelling of 13640690 in words is "thirteen million, six hundred forty thousand, six hundred ninety".