249339505 has 16 divisors (see below), whose sum is σ = 303608448. Its totient is φ = 196560000.

The previous prime is 249339469. The next prime is 249339509. The reversal of 249339505 is 505933942.

It is not a de Polignac number, because 249339505 - 2¹⁷ = 249208433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249339509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97645 + ... + 100165.

It is an arithmetic number, because the mean of its divisors is an integer number (18975528).

Almost surely, 2^249339505 is an apocalyptic number.

It is an amenable number.

249339505 is a deficient number, since it is larger than the sum of its proper divisors (54268943).

249339505 is a wasteful number, since it uses less digits than its factorization.

249339505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 249339505 is about 15790.4878012049. The cubic root of 249339505 is about 629.4052546197.

The spelling of 249339505 in words is "two hundred forty-nine million, three hundred thirty-nine thousand, five hundred five".