15740449 has 4 divisors (see below), whose sum is σ = 15887664. Its totient is φ = 15593236.

The previous prime is 15740443. The next prime is 15740471. The reversal of 15740449 is 94404751.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94404751 = 7 ⋅13486393.

It is a cyclic number.

It is not a de Polignac number, because 15740449 - 2⁷ = 15740321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15740443) 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, 73447 + ... + 73660.

It is an arithmetic number, because the mean of its divisors is an integer number (3971916).

Almost surely, 2^15740449 is an apocalyptic number.

It is an amenable number.

15740449 is a deficient number, since it is larger than the sum of its proper divisors (147215).

15740449 is a wasteful number, since it uses less digits than its factorization.

15740449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147214.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 15740449 is about 3967.4234712216. The cubic root of 15740449 is about 250.6142177106.

The spelling of 15740449 in words is "fifteen million, seven hundred forty thousand, four hundred forty-nine".