13421640 has 32 divisors (see below), whose sum is σ = 40265280. Its totient is φ = 3579072.

The previous prime is 13421591. The next prime is 13421651. The reversal of 13421640 is 4612431.

It is a super-3 number, since 3×13421640³ (a number of 22 digits) contains 333 as substring.

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, 55804 + ... + 56043.

It is an arithmetic number, because the mean of its divisors is an integer number (1258290).

Almost surely, 2^13421640 is an apocalyptic number.

13421640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13421640 is an abundant number, since it is smaller than the sum of its proper divisors (26843640).

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

13421640 is a wasteful number, since it uses less digits than its factorization.

13421640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111861 (or 111857 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 13421640 is about 3663.5556499117. Note that the first 3 decimals coincide. The cubic root of 13421640 is about 237.6485644814.

The spelling of 13421640 in words is "thirteen million, four hundred twenty-one thousand, six hundred forty".