445678138 has 8 divisors (see below), whose sum is σ = 672252480. Its totient is φ = 221593980.

The previous prime is 445678133. The next prime is 445678141. The reversal of 445678138 is 831876544.

It is a happy number.

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

It is a super-2 number, since 2×445678138² = 397258005382294088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (445678133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622098 + ... + 622813.

It is an arithmetic number, because the mean of its divisors is an integer number (84031560).

Almost surely, 2^445678138 is an apocalyptic number.

445678138 is a deficient number, since it is larger than the sum of its proper divisors (226574342).

445678138 is a wasteful number, since it uses less digits than its factorization.

445678138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245092.

The product of its digits is 645120, while the sum is 46.

The square root of 445678138 is about 21111.0904029138. The cubic root of 445678138 is about 763.8482893210.

The spelling of 445678138 in words is "four hundred forty-five million, six hundred seventy-eight thousand, one hundred thirty-eight".