249240389 has 4 divisors (see below), whose sum is σ = 254543424. Its totient is φ = 243937356.

The previous prime is 249240377. The next prime is 249240391. The reversal of 249240389 is 983042942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249240389 - 2⁴ = 249240373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249240289) 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, 2651447 + ... + 2651540.

It is an arithmetic number, because the mean of its divisors is an integer number (63635856).

Almost surely, 2^249240389 is an apocalyptic number.

It is an amenable number.

249240389 is a deficient number, since it is larger than the sum of its proper divisors (5303035).

249240389 is an equidigital number, since it uses as much as digits as its factorization.

249240389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303034.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 249240389 is about 15787.3490174887. The cubic root of 249240389 is about 629.3218443859.

The spelling of 249240389 in words is "two hundred forty-nine million, two hundred forty thousand, three hundred eighty-nine".