15390745 has 4 divisors (see below), whose sum is σ = 18468900. Its totient is φ = 12312592.

The previous prime is 15390733. The next prime is 15390751. The reversal of 15390745 is 54709351.

15390745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10942864 + 4447881 = 3308^2 + 2109^2 .

It is a cyclic number.

It is not a de Polignac number, because 15390745 - 2¹¹ = 15388697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15390745.

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, 1539070 + ... + 1539079.

It is an arithmetic number, because the mean of its divisors is an integer number (4617225).

Almost surely, 2^15390745 is an apocalyptic number.

It is an amenable number.

15390745 is a deficient number, since it is larger than the sum of its proper divisors (3078155).

15390745 is an equidigital number, since it uses as much as digits as its factorization.

15390745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078154.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 15390745 is about 3923.1040006607. The cubic root of 15390745 is about 248.7443438694.

The spelling of 15390745 in words is "fifteen million, three hundred ninety thousand, seven hundred forty-five".