6445858 has 4 divisors (see below), whose sum is σ = 9668790. Its totient is φ = 3222928.

The previous prime is 6445853. The next prime is 6445871. The reversal of 6445858 is 8585446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8585446 = 2 ⋅4292723.

It can be written as a sum of positive squares in only one way, i.e., 5184729 + 1261129 = 2277^2 + 1123^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6445858.

It is not an unprimeable number, because it can be changed into a prime (6445853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611463 + ... + 1611466.

Almost surely, 2^6445858 is an apocalyptic number.

6445858 is a deficient number, since it is larger than the sum of its proper divisors (3222932).

6445858 is a wasteful number, since it uses less digits than its factorization.

6445858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222931.

The product of its digits is 153600, while the sum is 40.

The square root of 6445858 is about 2538.8694334290. The cubic root of 6445858 is about 186.1059441913.

It can be divided in two parts, 64458 and 58, that added together give a square (64516 = 254²).

The spelling of 6445858 in words is "six million, four hundred forty-five thousand, eight hundred fifty-eight".