19342721 has 8 divisors (see below), whose sum is σ = 19837440. Its totient is φ = 18852912.

The previous prime is 19342717. The next prime is 19342723. The reversal of 19342721 is 12724391.

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

It is a cyclic number.

It is not a de Polignac number, because 19342721 - 2² = 19342717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19342723) 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, 7520 + ... + 9758.

It is an arithmetic number, because the mean of its divisors is an integer number (2479680).

Almost surely, 2^19342721 is an apocalyptic number.

It is an amenable number.

19342721 is a deficient number, since it is larger than the sum of its proper divisors (494719).

19342721 is a wasteful number, since it uses less digits than its factorization.

19342721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455.

The product of its digits is 3024, while the sum is 29.

The square root of 19342721 is about 4398.0360389610. The cubic root of 19342721 is about 268.4350298872.

The spelling of 19342721 in words is "nineteen million, three hundred forty-two thousand, seven hundred twenty-one".