19013997 has 8 divisors (see below), whose sum is σ = 25730656. Its totient is φ = 12486672.

The previous prime is 19013993. The next prime is 19013999. The reversal of 19013997 is 79931091.

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

It is not a de Polignac number, because 19013997 - 2² = 19013993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19013993) 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, 47098 + ... + 47499.

It is an arithmetic number, because the mean of its divisors is an integer number (3216332).

Almost surely, 2^19013997 is an apocalyptic number.

It is an amenable number.

19013997 is a deficient number, since it is larger than the sum of its proper divisors (6716659).

19013997 is an equidigital number, since it uses as much as digits as its factorization.

19013997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94667.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 19013997 is about 4360.5042139643. The cubic root of 19013997 is about 266.9056744336.

The spelling of 19013997 in words is "nineteen million, thirteen thousand, nine hundred ninety-seven".