15040643 has 4 divisors (see below), whose sum is σ = 15694608. Its totient is φ = 14386680.

The previous prime is 15040637. The next prime is 15040651. The reversal of 15040643 is 34604051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34604051 = 71 ⋅487381.

It is a cyclic number.

It is not a de Polignac number, because 15040643 - 2¹² = 15036547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 653941 = 15040643 / (1 + 5 + 0 + 4 + 0 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15040603) 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, 326948 + ... + 326993.

It is an arithmetic number, because the mean of its divisors is an integer number (3923652).

Almost surely, 2^15040643 is an apocalyptic number.

15040643 is a deficient number, since it is larger than the sum of its proper divisors (653965).

15040643 is an equidigital number, since it uses as much as digits as its factorization.

15040643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653964.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 15040643 is about 3878.2267855297. The cubic root of 15040643 is about 246.8437493531.

Adding to 15040643 its reverse (34604051), we get a palindrome (49644694).

The spelling of 15040643 in words is "fifteen million, forty thousand, six hundred forty-three".