13433721 has 8 divisors (see below), whose sum is σ = 20470464. Its totient is φ = 7676400.

The previous prime is 13433683. The next prime is 13433729. The reversal of 13433721 is 12733431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13433721 - 2⁷ = 13433593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13433691 and 13433700.

It is not an unprimeable number, because it can be changed into a prime (13433729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319830 + ... + 319871.

It is an arithmetic number, because the mean of its divisors is an integer number (2558808).

Almost surely, 2^13433721 is an apocalyptic number.

It is an amenable number.

13433721 is a deficient number, since it is larger than the sum of its proper divisors (7036743).

13433721 is an equidigital number, since it uses as much as digits as its factorization.

13433721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639711.

The product of its digits is 1512, while the sum is 24.

The square root of 13433721 is about 3665.2040870871. The cubic root of 13433721 is about 237.7198466626.

The spelling of 13433721 in words is "thirteen million, four hundred thirty-three thousand, seven hundred twenty-one".