249434781 has 8 divisors (see below), whose sum is σ = 339656064. Its totient is φ = 162751680.

The previous prime is 249434777. The next prime is 249434789. The reversal of 249434781 is 187434942.

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

It is not a de Polignac number, because 249434781 - 2² = 249434777 is a prime.

It is a super-2 number, since 2×249434781² = 124435419945035922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249434789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884380 + ... + 884661.

It is an arithmetic number, because the mean of its divisors is an integer number (42457008).

Almost surely, 2^249434781 is an apocalyptic number.

It is an amenable number.

249434781 is a deficient number, since it is larger than the sum of its proper divisors (90221283).

249434781 is a wasteful number, since it uses less digits than its factorization.

249434781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769091.

The product of its digits is 193536, while the sum is 42.

The square root of 249434781 is about 15793.5043926293. The cubic root of 249434781 is about 629.4854125000.

The spelling of 249434781 in words is "two hundred forty-nine million, four hundred thirty-four thousand, seven hundred eighty-one".