19499923 has 2 divisors, whose sum is σ = 19499924. Its totient is φ = 19499922.

The previous prime is 19499917. The next prime is 19499951. The reversal of 19499923 is 32999491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19499923 - 2⁵ = 19499891 is a prime.

It is not a weakly prime, because it can be changed into another prime (19499903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749961 + 9749962.

It is an arithmetic number, because the mean of its divisors is an integer number (9749962).

Almost surely, 2^19499923 is an apocalyptic number.

19499923 is a deficient number, since it is larger than the sum of its proper divisors (1).

19499923 is an equidigital number, since it uses as much as digits as its factorization.

19499923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 46.

The square root of 19499923 is about 4415.8717146222. The cubic root of 19499923 is about 269.1602763241.

The spelling of 19499923 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred twenty-three".