15220279 has 4 divisors (see below), whose sum is σ = 15232360. Its totient is φ = 15208200.

The previous prime is 15220267. The next prime is 15220313. The reversal of 15220279 is 97202251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97202251 = 47 ⋅2068133.

It is a cyclic number.

It is not a de Polignac number, because 15220279 - 2¹⁹ = 14695991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220379) 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, 3897 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (3808090).

Almost surely, 2^15220279 is an apocalyptic number.

15220279 is a deficient number, since it is larger than the sum of its proper divisors (12081).

15220279 is a wasteful number, since it uses less digits than its factorization.

15220279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12080.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 15220279 is about 3901.3175979405. The cubic root of 15220279 is about 247.8225783994.

The spelling of 15220279 in words is "fifteen million, two hundred twenty thousand, two hundred seventy-nine".