13402920 has 64 divisors (see below), whose sum is σ = 40890240. Its totient is φ = 3513600.

The previous prime is 13402913. The next prime is 13402937. The reversal of 13402920 is 2920431.

It is a Cunningham number, because it is equal to 3661²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6405 + ... + 8235.

It is an arithmetic number, because the mean of its divisors is an integer number (638910).

Almost surely, 2^13402920 is an apocalyptic number.

13402920 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 13402920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20445120).

13402920 is an abundant number, since it is smaller than the sum of its proper divisors (27487320).

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

13402920 is a wasteful number, since it uses less digits than its factorization.

13402920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13402920 is about 3660.9998634253. Note that the first 3 decimals coincide. The cubic root of 13402920 is about 237.5380253058.

The spelling of 13402920 in words is "thirteen million, four hundred two thousand, nine hundred twenty".