249039389 has 4 divisors (see below), whose sum is σ = 249835356. Its totient is φ = 248243424.

The previous prime is 249039379. The next prime is 249039407. The reversal of 249039389 is 983930942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983930942 = 2 ⋅491965471.

It can be written as a sum of positive squares in 2 ways, for example, as 40005625 + 209033764 = 6325^2 + 14458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249039389 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 (249039319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397514 + ... + 398139.

It is an arithmetic number, because the mean of its divisors is an integer number (62458839).

Almost surely, 2^249039389 is an apocalyptic number.

It is an amenable number.

249039389 is a deficient number, since it is larger than the sum of its proper divisors (795967).

249039389 is an equidigital number, since it uses as much as digits as its factorization.

249039389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795966.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 249039389 is about 15780.9818769302. The cubic root of 249039389 is about 629.1526266144.

The spelling of 249039389 in words is "two hundred forty-nine million, thirty-nine thousand, three hundred eighty-nine".