15420432 has 40 divisors (see below), whose sum is σ = 40202784. Its totient is φ = 5092864.

The previous prime is 15420421. The next prime is 15420443. The reversal of 15420432 is 23402451.

It is an interprime number because it is at equal distance from previous prime (15420421) and next prime (15420443).

It is a junction number, because it is equal to n+sod(n) for n = 15420399 and 15420408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4003 + ... + 6845.

Almost surely, 2^15420432 is an apocalyptic number.

15420432 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 15420432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20101392).

15420432 is an abundant number, since it is smaller than the sum of its proper divisors (24782352).

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

15420432 is a wasteful number, since it uses less digits than its factorization.

15420432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967 (or 2961 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 15420432 is about 3926.8857890191. The cubic root of 15420432 is about 248.9041743494.

Adding to 15420432 its reverse (23402451), we get a palindrome (38822883).

The spelling of 15420432 in words is "fifteen million, four hundred twenty thousand, four hundred thirty-two".