19120397 has 4 divisors (see below), whose sum is σ = 19737216. Its totient is φ = 18503580.

The previous prime is 19120313. The next prime is 19120421. The reversal of 19120397 is 79302191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19120397 - 2⁸ = 19120141 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 (19120097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308363 + ... + 308424.

It is an arithmetic number, because the mean of its divisors is an integer number (4934304).

Almost surely, 2^19120397 is an apocalyptic number.

It is an amenable number.

19120397 is a deficient number, since it is larger than the sum of its proper divisors (616819).

19120397 is an equidigital number, since it uses as much as digits as its factorization.

19120397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616818.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 19120397 is about 4372.6876174728. The cubic root of 19120397 is about 267.4026058227.

The spelling of 19120397 in words is "nineteen million, one hundred twenty thousand, three hundred ninety-seven".