15440493 has 4 divisors (see below), whose sum is σ = 20587328. Its totient is φ = 10293660.

The previous prime is 15440461. The next prime is 15440497. The reversal of 15440493 is 39404451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15440493 - 2⁵ = 15440461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15440493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15440497) 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, 2573413 + ... + 2573418.

It is an arithmetic number, because the mean of its divisors is an integer number (5146832).

Almost surely, 2^15440493 is an apocalyptic number.

It is an amenable number.

15440493 is a deficient number, since it is larger than the sum of its proper divisors (5146835).

15440493 is an equidigital number, since it uses as much as digits as its factorization.

15440493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146834.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 15440493 is about 3929.4392729752. The cubic root of 15440493 is about 249.0120637371.

The spelling of 15440493 in words is "fifteen million, four hundred forty thousand, four hundred ninety-three".