40099999 has 8 divisors (see below), whose sum is σ = 40968720. Its totient is φ = 39237696.

The previous prime is 40099987. The next prime is 40100003. The reversal of 40099999 is 99999004.

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

It is a cyclic number.

It is not a de Polignac number, because 40099999 - 2¹⁷ = 39968927 is a prime.

It is a Duffinian number.

40099999 is a modest number, since divided by 9999 gives 4009 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40099909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12289 + ... + 15205.

It is an arithmetic number, because the mean of its divisors is an integer number (5121090).

Almost surely, 2^40099999 is an apocalyptic number.

40099999 is a deficient number, since it is larger than the sum of its proper divisors (868721).

40099999 is a wasteful number, since it uses less digits than its factorization.

40099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3209.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 40099999 is about 6332.4560006367. The cubic root of 40099999 is about 342.2799453139.

The spelling of 40099999 in words is "forty million, ninety-nine thousand, nine hundred ninety-nine".