249989885 has 4 divisors (see below), whose sum is σ = 299987868. Its totient is φ = 199991904.

The previous prime is 249989881. The next prime is 249989951. The reversal of 249989885 is 588989942.

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 133587364 + 116402521 = 11558^2 + 10789^2 .

It is a cyclic number.

It is not a de Polignac number, because 249989885 - 2² = 249989881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249989881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24998984 + ... + 24998993.

It is an arithmetic number, because the mean of its divisors is an integer number (74996967).

Almost surely, 2^249989885 is an apocalyptic number.

It is an amenable number.

249989885 is a deficient number, since it is larger than the sum of its proper divisors (49997983).

249989885 is an equidigital number, since it uses as much as digits as its factorization.

249989885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49997982.

The product of its digits is 14929920, while the sum is 62.

The square root of 249989885 is about 15811.0684332211. The cubic root of 249989885 is about 629.9520287652.

The spelling of 249989885 in words is "two hundred forty-nine million, nine hundred eighty-nine thousand, eight hundred eighty-five".