249958405 has 4 divisors (see below), whose sum is σ = 299950092. Its totient is φ = 199966720.

The previous prime is 249958403. The next prime is 249958409. The reversal of 249958405 is 504859942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504859942 = 2 ⋅252429971.

It can be written as a sum of positive squares in 2 ways, for example, as 172817316 + 77141089 = 13146^2 + 8783^2 .

It is not a de Polignac number, because 249958405 - 2¹ = 249958403 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 (249958403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24995836 + ... + 24995845.

It is an arithmetic number, because the mean of its divisors is an integer number (74987523).

Almost surely, 2^249958405 is an apocalyptic number.

It is an amenable number.

249958405 is a deficient number, since it is larger than the sum of its proper divisors (49991687).

249958405 is an equidigital number, since it uses as much as digits as its factorization.

249958405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49991686.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 249958405 is about 15810.0728967326. The cubic root of 249958405 is about 629.9255853989.

The spelling of 249958405 in words is "two hundred forty-nine million, nine hundred fifty-eight thousand, four hundred five".