445306138 has 4 divisors (see below), whose sum is σ = 667959210. Its totient is φ = 222653068.

The previous prime is 445306133. The next prime is 445306139. The reversal of 445306138 is 831603544.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 392554969 + 52751169 = 19813^2 + 7263^2 .

It is not an unprimeable number, because it can be changed into a prime (445306133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111326533 + ... + 111326536.

Almost surely, 2^445306138 is an apocalyptic number.

445306138 is a deficient number, since it is larger than the sum of its proper divisors (222653072).

445306138 is a wasteful number, since it uses less digits than its factorization.

445306138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222653071.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 445306138 is about 21102.2780286869. The cubic root of 445306138 is about 763.6357064165.

The spelling of 445306138 in words is "four hundred forty-five million, three hundred six thousand, one hundred thirty-eight".