253404985 has 8 divisors (see below), whose sum is σ = 304582536. Its totient is φ = 202392960.

The previous prime is 253404979. The next prime is 253405001. The reversal of 253404985 is 589404352.

It can be written as a sum of positive squares in 4 ways, for example, as 13402921 + 240002064 = 3661^2 + 15492^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 253404985 - 2⁵ = 253404953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37986 + ... + 44155.

It is an arithmetic number, because the mean of its divisors is an integer number (38072817).

Almost surely, 2^253404985 is an apocalyptic number.

It is an amenable number.

253404985 is a deficient number, since it is larger than the sum of its proper divisors (51177551).

253404985 is an equidigital number, since it uses as much as digits as its factorization.

253404985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82763.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 253404985 is about 15918.6992244970. The cubic root of 253404985 is about 632.8076461163.

The spelling of 253404985 in words is "two hundred fifty-three million, four hundred four thousand, nine hundred eighty-five".