249252640 has 384 divisors, whose sum is σ = 823011840. Its totient is φ = 69009408.

The previous prime is 249252611. The next prime is 249252643. The reversal of 249252640 is 46252942.

249252640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 249252596 and 249252605.

It is not an unprimeable number, because it can be changed into a prime (249252643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4702854 + ... + 4702906.

It is an arithmetic number, because the mean of its divisors is an integer number (2143260).

Almost surely, 2^249252640 is an apocalyptic number.

249252640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249252640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411505920).

249252640 is an abundant number, since it is smaller than the sum of its proper divisors (573759200).

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

249252640 is a wasteful number, since it uses less digits than its factorization.

249252640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 249252640 is about 15787.7370132644. The cubic root of 249252640 is about 629.3321553092.

The spelling of 249252640 in words is "two hundred forty-nine million, two hundred fifty-two thousand, six hundred forty".