257821452 has 36 divisors (see below), whose sum is σ = 744818256. Its totient is φ = 73663200.

The previous prime is 257821423. The next prime is 257821453. The reversal of 257821452 is 254128752.

It is a happy number.

257821452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×257821452² = 132943802222776608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (257821453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 511299 + ... + 511802.

It is an arithmetic number, because the mean of its divisors is an integer number (20689396).

Almost surely, 2^257821452 is an apocalyptic number.

It is an amenable number.

257821452 is an abundant number, since it is smaller than the sum of its proper divisors (486996804).

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

257821452 is a wasteful number, since it uses less digits than its factorization.

257821452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023118 (or 1023113 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 257821452 is about 16056.8194858135. The cubic root of 257821452 is about 636.4627876501.

The spelling of 257821452 in words is "two hundred fifty-seven million, eight hundred twenty-one thousand, four hundred fifty-two".