15432643 has 4 divisors (see below), whose sum is σ = 15457288. Its totient is φ = 15408000.

The previous prime is 15432623. The next prime is 15432661. The reversal of 15432643 is 34623451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34623451 = 3343 ⋅10357.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15432643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15432623) 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, 11358 + ... + 12643.

It is an arithmetic number, because the mean of its divisors is an integer number (3864322).

Almost surely, 2^15432643 is an apocalyptic number.

15432643 is a deficient number, since it is larger than the sum of its proper divisors (24645).

15432643 is an equidigital number, since it uses as much as digits as its factorization.

15432643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24644.

The product of its digits is 8640, while the sum is 28.

The square root of 15432643 is about 3928.4402757329. The cubic root of 15432643 is about 248.9698570523.

It can be divided in two parts, 1543 and 2643, that added together give a triangular number (4186 = T₉₁).

The spelling of 15432643 in words is "fifteen million, four hundred thirty-two thousand, six hundred forty-three".