15642422 has 4 divisors (see below), whose sum is σ = 23463636. Its totient is φ = 7821210.

The previous prime is 15642421. The next prime is 15642433. The reversal of 15642422 is 22424651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22424651 = 73 ⋅307187.

It is a junction number, because it is equal to n+sod(n) for n = 15642391 and 15642400.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 3910604 + ... + 3910607.

It is an arithmetic number, because the mean of its divisors is an integer number (5865909).

Almost surely, 2^15642422 is an apocalyptic number.

15642422 is a deficient number, since it is larger than the sum of its proper divisors (7821214).

15642422 is an equidigital number, since it uses as much as digits as its factorization.

15642422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821213.

The product of its digits is 3840, while the sum is 26.

The square root of 15642422 is about 3955.0501893149. The cubic root of 15642422 is about 250.0928828202.

The spelling of 15642422 in words is "fifteen million, six hundred forty-two thousand, four hundred twenty-two".