40445999 has 4 divisors (see below), whose sum is σ = 44122920. Its totient is φ = 36769080.

The previous prime is 40445987. The next prime is 40446001. The reversal of 40445999 is 99954404.

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

It is a cyclic number.

It is not a de Polignac number, because 40445999 - 2¹⁶ = 40380463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40445399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1838444 + ... + 1838465.

It is an arithmetic number, because the mean of its divisors is an integer number (11030730).

Almost surely, 2^40445999 is an apocalyptic number.

40445999 is a deficient number, since it is larger than the sum of its proper divisors (3676921).

40445999 is a wasteful number, since it uses less digits than its factorization.

40445999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676920.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 40445999 is about 6359.7168962148. The cubic root of 40445999 is about 343.2615734861.

The spelling of 40445999 in words is "forty million, four hundred forty-five thousand, nine hundred ninety-nine".