253989540 has 288 divisors, whose sum is σ = 953769600. Its totient is φ = 55883520.

The previous prime is 253989523. The next prime is 253989559. The reversal of 253989540 is 45989352.

253989540 is a `hidden beast` number, since 25 + 3 + 9 + 89 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 767175 + ... + 767505.

It is an arithmetic number, because the mean of its divisors is an integer number (3311700).

Almost surely, 2^253989540 is an apocalyptic number.

253989540 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 253989540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476884800).

253989540 is an abundant number, since it is smaller than the sum of its proper divisors (699780060).

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

253989540 is a wasteful number, since it uses less digits than its factorization.

253989540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 253989540 is about 15937.0492877446. The cubic root of 253989540 is about 633.2938596512.

The spelling of 253989540 in words is "two hundred fifty-three million, nine hundred eighty-nine thousand, five hundred forty".