13851631840 has 48 divisors (see below), whose sum is σ = 32744718720. Its totient is φ = 5537226240.

The previous prime is 13851631817. The next prime is 13851631877. The reversal of 13851631840 is 4813615831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 13851631793 and 13851631802.

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, 241105 + ... + 292975.

It is an arithmetic number, because the mean of its divisors is an integer number (682181640).

Almost surely, 2^13851631840 is an apocalyptic number.

13851631840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13851631840 is an abundant number, since it is smaller than the sum of its proper divisors (18893086880).

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

13851631840 is a wasteful number, since it uses less digits than its factorization.

13851631840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53555 (or 53547 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 13851631840 in words is "thirteen billion, eight hundred fifty-one million, six hundred thirty-one thousand, eight hundred forty".