13840385 has 16 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 10073280.

The previous prime is 13840381. The next prime is 13840399. The reversal of 13840385 is 58304831.

It is a happy number.

It is not a de Polignac number, because 13840385 - 2² = 13840381 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13840381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3116 + ... + 6114.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

It is a Proth number, since it is equal to 3379 ⋅ 2¹² + 1 and 3379 < 2¹².

Almost surely, 2^13840385 is an apocalyptic number.

It is an amenable number.

13840385 is a deficient number, since it is larger than the sum of its proper divisors (4303615).

13840385 is a wasteful number, since it uses less digits than its factorization.

13840385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 13840385 is about 3720.2667915084. The cubic root of 13840385 is about 240.0947831642.

The spelling of 13840385 in words is "thirteen million, eight hundred forty thousand, three hundred eighty-five".