13640506 has 16 divisors (see below), whose sum is σ = 22495968. Its totient is φ = 6151600.

The previous prime is 13640491. The next prime is 13640509. The reversal of 13640506 is 60504631.

It is a super-3 number, since 3×13640506³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13640509) 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, 516 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (1405998).

Almost surely, 2^13640506 is an apocalyptic number.

13640506 is a deficient number, since it is larger than the sum of its proper divisors (8855462).

13640506 is a wasteful number, since it uses less digits than its factorization.

13640506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 13640506 is about 3693.3055654792. The cubic root of 13640506 is about 238.9333801235.

The spelling of 13640506 in words is "thirteen million, six hundred forty thousand, five hundred six".