15840449 has 2 divisors, whose sum is σ = 15840450. Its totient is φ = 15840448.

The previous prime is 15840397. The next prime is 15840463. The reversal of 15840449 is 94404851.

It is a happy number.

15840449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 49 = 3980^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 15840449 - 2⁸ = 15840193 is a prime.

It is not a weakly prime, because it can be changed into another prime (15840499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7920224 + 7920225.

It is an arithmetic number, because the mean of its divisors is an integer number (7920225).

Almost surely, 2^15840449 is an apocalyptic number.

It is an amenable number.

15840449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15840449 is an equidigital number, since it uses as much as digits as its factorization.

15840449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 15840449 is about 3980.0061557741. The cubic root of 15840449 is about 251.1438200548.

It can be divided in two parts, 158404 and 49, that multiplied together give a square (7761796 = 2786²).

The spelling of 15840449 in words is "fifteen million, eight hundred forty thousand, four hundred forty-nine".