15432540 has 96 divisors (see below), whose sum is σ = 46158336. Its totient is φ = 3843840.

The previous prime is 15432533. The next prime is 15432551. The reversal of 15432540 is 4523451.

It is a self number, because there is not a number n which added to its sum of digits gives 15432540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73035 + ... + 73245.

It is an arithmetic number, because the mean of its divisors is an integer number (480816).

Almost surely, 2^15432540 is an apocalyptic number.

15432540 is a gapful number since it is divisible by the number (10) 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 15432540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23079168).

15432540 is an abundant number, since it is smaller than the sum of its proper divisors (30725796).

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

15432540 is a wasteful number, since it uses less digits than its factorization.

15432540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 15432540 is about 3928.4271661824. The cubic root of 15432540 is about 248.9693031625.

Adding to 15432540 its reverse (4523451), we get a palindrome (19955991).

The spelling of 15432540 in words is "fifteen million, four hundred thirty-two thousand, five hundred forty".