15222739 has 4 divisors (see below), whose sum is σ = 17397424. Its totient is φ = 13048056.

The previous prime is 15222719. The next prime is 15222761. The reversal of 15222739 is 93722251.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15222739 - 2⁵ = 15222707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15222739.

It is not an unprimeable number, because it can be changed into a prime (15222719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087332 + ... + 1087345.

It is an arithmetic number, because the mean of its divisors is an integer number (4349356).

Almost surely, 2^15222739 is an apocalyptic number.

15222739 is a deficient number, since it is larger than the sum of its proper divisors (2174685).

15222739 is an equidigital number, since it uses as much as digits as its factorization.

15222739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174684.

The product of its digits is 7560, while the sum is 31.

The square root of 15222739 is about 3901.6328633022. The cubic root of 15222739 is about 247.8359292432.

The spelling of 15222739 in words is "fifteen million, two hundred twenty-two thousand, seven hundred thirty-nine".