15220425 has 48 divisors (see below), whose sum is σ = 28926720. Its totient is φ = 6984000.

The previous prime is 15220421. The next prime is 15220441. The reversal of 15220425 is 52402251.

It is a happy number.

It is not a de Polignac number, because 15220425 - 2² = 15220421 is a prime.

It is a super-2 number, since 2×15220425² = 463322674361250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15220421) 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 47 ways as a sum of consecutive naturals, for example, 15190 + ... + 16160.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^15220425 is an apocalyptic number.

15220425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15220425 is a deficient number, since it is larger than the sum of its proper divisors (13706295).

15220425 is a wasteful number, since it uses less digits than its factorization.

15220425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1009 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 15220425 is about 3901.3363095227. The cubic root of 15220425 is about 247.8233708067.

Adding to 15220425 its reverse (52402251), we get a palindrome (67622676).

The spelling of 15220425 in words is "fifteen million, two hundred twenty thousand, four hundred twenty-five".