19472723 has 4 divisors (see below), whose sum is σ = 19517520. Its totient is φ = 19427928.

The previous prime is 19472647. The next prime is 19472729. The reversal of 19472723 is 32727491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32727491 = 167 ⋅195973.

It is a cyclic number.

It is not a de Polignac number, because 19472723 - 2¹² = 19468627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19472729) 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, 21740 + ... + 22617.

It is an arithmetic number, because the mean of its divisors is an integer number (4879380).

Almost surely, 2^19472723 is an apocalyptic number.

19472723 is a deficient number, since it is larger than the sum of its proper divisors (44797).

19472723 is an equidigital number, since it uses as much as digits as its factorization.

19472723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44796.

The product of its digits is 21168, while the sum is 35.

The square root of 19472723 is about 4412.7908402733. The cubic root of 19472723 is about 269.0350695699.

The spelling of 19472723 in words is "nineteen million, four hundred seventy-two thousand, seven hundred twenty-three".