253443740 has 96 divisors (see below), whose sum is σ = 600735744. Its totient is φ = 89026560.

The previous prime is 253443733. The next prime is 253443761. The reversal of 253443740 is 47344352.

It is a junction number, because it is equal to n+sod(n) for n = 253443697 and 253443706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1313084 + ... + 1313276.

It is an arithmetic number, because the mean of its divisors is an integer number (6257664).

Almost surely, 2^253443740 is an apocalyptic number.

253443740 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 253443740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300367872).

253443740 is an abundant number, since it is smaller than the sum of its proper divisors (347292004).

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

253443740 is a wasteful number, since it uses less digits than its factorization.

253443740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 32.

The square root of 253443740 is about 15919.9164570672. The cubic root of 253443740 is about 632.8399043744.

The spelling of 253443740 in words is "two hundred fifty-three million, four hundred forty-three thousand, seven hundred forty".