15420252 has 12 divisors (see below), whose sum is σ = 35980616. Its totient is φ = 5140080.

The previous prime is 15420221. The next prime is 15420253. The reversal of 15420252 is 25202451.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×15420252³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420253) 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, 642499 + ... + 642522.

Almost surely, 2^15420252 is an apocalyptic number.

15420252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15420252 is an abundant number, since it is smaller than the sum of its proper divisors (20560364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15420252 is a wasteful number, since it uses less digits than its factorization.

15420252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285028 (or 1285026 counting only the distinct ones).

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

The square root of 15420252 is about 3926.8628700274. The cubic root of 15420252 is about 248.9032058740.

The spelling of 15420252 in words is "fifteen million, four hundred twenty thousand, two hundred fifty-two".