249071538 has 16 divisors (see below), whose sum is σ = 498405600. Its totient is φ = 82980096.

The previous prime is 249071533. The next prime is 249071561. The reversal of 249071538 is 835170942.

It is a junction number, because it is equal to n+sod(n) for n = 249071496 and 249071505.

It is not an unprimeable number, because it can be changed into a prime (249071533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2706 + ... + 22482.

It is an arithmetic number, because the mean of its divisors is an integer number (31150350).

Almost surely, 2^249071538 is an apocalyptic number.

249071538 is an abundant number, since it is smaller than the sum of its proper divisors (249334062).

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

249071538 is a wasteful number, since it uses less digits than its factorization.

249071538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21881.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 249071538 is about 15782.0004435433. Note that the first 3 decimals coincide. The cubic root of 249071538 is about 629.1796983125.

The spelling of 249071538 in words is "two hundred forty-nine million, seventy-one thousand, five hundred thirty-eight".