249138040 has 32 divisors (see below), whose sum is σ = 564606000. Its totient is φ = 98936064.

The previous prime is 249138011. The next prime is 249138083. The reversal of 249138040 is 40831942.

It is a junction number, because it is equal to n+sod(n) for n = 249137993 and 249138011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16845 + ... + 27964.

Almost surely, 2^249138040 is an apocalyptic number.

249138040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249138040 is an abundant number, since it is smaller than the sum of its proper divisors (315467960).

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

249138040 is a wasteful number, since it uses less digits than its factorization.

249138040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44959 (or 44955 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 249138040 is about 15784.1071967977. The cubic root of 249138040 is about 629.2356902379.

Adding to 249138040 its reverse (40831942), we get a palindrome (289969982).

The spelling of 249138040 in words is "two hundred forty-nine million, one hundred thirty-eight thousand, forty".