40219999 has 4 divisors (see below), whose sum is σ = 41307064. Its totient is φ = 39132936.

The previous prime is 40219997. The next prime is 40220021. The reversal of 40219999 is 99991204.

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 40219999 - 2¹ = 40219997 is a prime.

It is a Duffinian number.

40219999 is a modest number, since divided by 9999 gives 4021 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40219997) 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, 543477 + ... + 543550.

It is an arithmetic number, because the mean of its divisors is an integer number (10326766).

Almost surely, 2^40219999 is an apocalyptic number.

40219999 is a deficient number, since it is larger than the sum of its proper divisors (1087065).

40219999 is a wasteful number, since it uses less digits than its factorization.

40219999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087064.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 40219999 is about 6341.9239194427. The cubic root of 40219999 is about 342.6210316919.

The spelling of 40219999 in words is "forty million, two hundred nineteen thousand, nine hundred ninety-nine".