258404985 has 36 divisors (see below), whose sum is σ = 465164388. Its totient is φ = 137798496.

The previous prime is 258404963. The next prime is 258404987. The reversal of 258404985 is 589404852.

It can be written as a sum of positive squares in 2 ways, for example, as 64304361 + 194100624 = 8019^2 + 13932^2 .

It is not a de Polignac number, because 258404985 - 2⁷ = 258404857 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 258404985.

It is not an unprimeable number, because it can be changed into a prime (258404987) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28867 + ... + 36743.

It is an arithmetic number, because the mean of its divisors is an integer number (12921233).

Almost surely, 2^258404985 is an apocalyptic number.

It is an amenable number.

258404985 is a deficient number, since it is larger than the sum of its proper divisors (206759403).

258404985 is an frugal number, since it uses more digits than its factorization.

258404985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7906 (or 7885 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 258404985 is about 16074.9800933003. The cubic root of 258404985 is about 636.9425992816.

The spelling of 258404985 in words is "two hundred fifty-eight million, four hundred four thousand, nine hundred eighty-five".