15378013 has 12 divisors (see below), whose sum is σ = 18942012. Its totient is φ = 12405120.

The previous prime is 15377981. The next prime is 15378019. The reversal of 15378013 is 31087351.

It can be written as a sum of positive squares in 2 ways, for example, as 5631129 + 9746884 = 2373^2 + 3122^2 .

It is not a de Polignac number, because 15378013 - 2⁵ = 15377981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15378019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8398 + ... + 10063.

It is an arithmetic number, because the mean of its divisors is an integer number (1578501).

Almost surely, 2^15378013 is an apocalyptic number.

It is an amenable number.

15378013 is a deficient number, since it is larger than the sum of its proper divisors (3563999).

15378013 is a wasteful number, since it uses less digits than its factorization.

15378013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18492 (or 18485 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 15378013 is about 3921.4809702458. The cubic root of 15378013 is about 248.6757336605.

The spelling of 15378013 in words is "fifteen million, three hundred seventy-eight thousand, thirteen".