15440066 has 8 divisors (see below), whose sum is σ = 23597244. Its totient is φ = 7574320.

The previous prime is 15440059. The next prime is 15440071. The reversal of 15440066 is 66004451.

It is a happy number.

15440066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15437041 + 3025 = 3929^2 + 55^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72725 + ... + 72936.

Almost surely, 2^15440066 is an apocalyptic number.

15440066 is a deficient number, since it is larger than the sum of its proper divisors (8157178).

15440066 is a wasteful number, since it uses less digits than its factorization.

15440066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145716.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 15440066 is about 3929.3849391476. The cubic root of 15440066 is about 249.0097682764.

The spelling of 15440066 in words is "fifteen million, four hundred forty thousand, sixty-six".