249139858 has 8 divisors (see below), whose sum is σ = 407683440. Its totient is φ = 113245380.

The previous prime is 249139853. The next prime is 249139859. The reversal of 249139858 is 858931942.

249139858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (249139853) 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, 5662248 + ... + 5662291.

It is an arithmetic number, because the mean of its divisors is an integer number (50960430).

Almost surely, 2^249139858 is an apocalyptic number.

249139858 is a deficient number, since it is larger than the sum of its proper divisors (158543582).

249139858 is a wasteful number, since it uses less digits than its factorization.

249139858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11324552.

The product of its digits is 622080, while the sum is 49.

The square root of 249139858 is about 15784.1647862660. The cubic root of 249139858 is about 629.2372207786.

The spelling of 249139858 in words is "two hundred forty-nine million, one hundred thirty-nine thousand, eight hundred fifty-eight".