249502638 has 64 divisors (see below), whose sum is σ = 623946240. Its totient is φ = 64617600.

The previous prime is 249502621. The next prime is 249502639. The reversal of 249502638 is 836205942.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 249502596 and 249502605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249502639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234628 + ... + 235688.

It is an arithmetic number, because the mean of its divisors is an integer number (9749160).

Almost surely, 2^249502638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249502638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311973120).

249502638 is an abundant number, since it is smaller than the sum of its proper divisors (374443602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249502638 is a wasteful number, since it uses less digits than its factorization.

249502638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 249502638 is about 15795.6525031415. The cubic root of 249502638 is about 629.5424897028.

The spelling of 249502638 in words is "two hundred forty-nine million, five hundred two thousand, six hundred thirty-eight".