13907840 has 64 divisors (see below), whose sum is σ = 34369920. Its totient is φ = 5376000.

The previous prime is 13907837. The next prime is 13907851. The reversal of 13907840 is 4870931.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 13907797 and 13907806.

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, 19490 + ... + 20190.

It is an arithmetic number, because the mean of its divisors is an integer number (537030).

Almost surely, 2^13907840 is an apocalyptic number.

13907840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13907840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17184960).

13907840 is an abundant number, since it is smaller than the sum of its proper divisors (20462080).

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

13907840 is an equidigital number, since it uses as much as digits as its factorization.

13907840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 13907840 is about 3729.3216541350. The cubic root of 13907840 is about 240.4842076239.

The spelling of 13907840 in words is "thirteen million, nine hundred seven thousand, eight hundred forty".