15540252 has 144 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 3846528.

The previous prime is 15540251. The next prime is 15540277. The reversal of 15540252 is 25204551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145183 + ... + 145289.

It is an arithmetic number, because the mean of its divisors is an integer number (335160).

Almost surely, 2^15540252 is an apocalyptic number.

15540252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15540252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24131520).

15540252 is an abundant number, since it is smaller than the sum of its proper divisors (32722788).

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

15540252 is a wasteful number, since it uses less digits than its factorization.

15540252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 15540252 is about 3942.1126315721. The cubic root of 15540252 is about 249.5471910179.

The spelling of 15540252 in words is "fifteen million, five hundred forty thousand, two hundred fifty-two".