13851640 has 32 divisors (see below), whose sum is σ = 34000560. Its totient is φ = 5036800.

The previous prime is 13851631. The next prime is 13851679. The reversal of 13851640 is 4615831.

It is a junction number, because it is equal to n+sod(n) for n = 13851599 and 13851608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15301 + ... + 16180.

Almost surely, 2^13851640 is an apocalyptic number.

13851640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13851640 is an abundant number, since it is smaller than the sum of its proper divisors (20148920).

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

13851640 is a wasteful number, since it uses less digits than its factorization.

13851640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31503 (or 31499 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 13851640 is about 3721.7791444415. The cubic root of 13851640 is about 240.1598472170.

It can be divided in two parts, 1385 and 1640, that added together give a square (3025 = 55²).

The spelling of 13851640 in words is "thirteen million, eight hundred fifty-one thousand, six hundred forty".