1491723423 has 24 divisors (see below), whose sum is σ = 2167437168. Its totient is φ = 988630272.

The previous prime is 1491723403. The next prime is 1491723427. The reversal of 1491723423 is 3243271941.

It is a happy number.

1491723423 is a `hidden beast` number, since 149 + 172 + 342 + 3 = 666.

It is not a de Polignac number, because 1491723423 - 2¹⁶ = 1491657887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491723427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1688940 + ... + 1689822.

It is an arithmetic number, because the mean of its divisors is an integer number (90309882).

Almost surely, 2^1491723423 is an apocalyptic number.

1491723423 is a deficient number, since it is larger than the sum of its proper divisors (675713745).

1491723423 is a wasteful number, since it uses less digits than its factorization.

1491723423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1780 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1491723423 is about 38622.8355121682. The cubic root of 1491723423 is about 1142.6049548380.

The spelling of 1491723423 in words is "one billion, four hundred ninety-one million, seven hundred twenty-three thousand, four hundred twenty-three".