249139985 has 16 divisors (see below), whose sum is σ = 306854352. Its totient is φ = 194073600.

The previous prime is 249139967. The next prime is 249140029. The reversal of 249139985 is 589931942.

It is a happy number.

249139985 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 8 ways, for example, as 148157584 + 100982401 = 12172^2 + 10049^2 .

It is a de Polignac number, because none of the positive numbers 2^k-249139985 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155207 + ... + 156803.

It is an arithmetic number, because the mean of its divisors is an integer number (19178397).

Almost surely, 2^249139985 is an apocalyptic number.

It is an amenable number.

249139985 is a deficient number, since it is larger than the sum of its proper divisors (57714367).

249139985 is a wasteful number, since it uses less digits than its factorization.

249139985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its digits is 699840, while the sum is 50.

The square root of 249139985 is about 15784.1688092848. The cubic root of 249139985 is about 629.2373276973.

The spelling of 249139985 in words is "two hundred forty-nine million, one hundred thirty-nine thousand, nine hundred eighty-five".