15642423 has 16 divisors (see below), whose sum is σ = 23522560. Its totient is φ = 10271448.

The previous prime is 15642421. The next prime is 15642433. The reversal of 15642423 is 32424651.

15642423 is a `hidden beast` number, since 15 + 642 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 15642423 - 2¹ = 15642421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15642421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2515 + ... + 6132.

It is an arithmetic number, because the mean of its divisors is an integer number (1470160).

Almost surely, 2^15642423 is an apocalyptic number.

15642423 is a deficient number, since it is larger than the sum of its proper divisors (7880137).

15642423 is an equidigital number, since it uses as much as digits as its factorization.

15642423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723 (or 8717 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 15642423 is about 3955.0503157356. The cubic root of 15642423 is about 250.0928881496.

The spelling of 15642423 in words is "fifteen million, six hundred forty-two thousand, four hundred twenty-three".