249349940 has 48 divisors (see below), whose sum is σ = 599380992. Its totient is φ = 85357056.

The previous prime is 249349921. The next prime is 249349949. The reversal of 249349940 is 49943942.

It is a junction number, because it is equal to n+sod(n) for n = 249349891 and 249349900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249349949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135869 + ... + 137691.

It is an arithmetic number, because the mean of its divisors is an integer number (12487104).

Almost surely, 2^249349940 is an apocalyptic number.

249349940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249349940 is an abundant number, since it is smaller than the sum of its proper divisors (350031052).

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

249349940 is a wasteful number, since it uses less digits than its factorization.

249349940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816 (or 2814 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 249349940 is about 15790.8182181925. The cubic root of 249349940 is about 629.4140348198.

The spelling of 249349940 in words is "two hundred forty-nine million, three hundred forty-nine thousand, nine hundred forty".