40699209 has 16 divisors (see below), whose sum is σ = 56301120. Its totient is φ = 26120640.

The previous prime is 40699123. The next prime is 40699229. The reversal of 40699209 is 90299604.

It is not a de Polignac number, because 40699209 - 2¹¹ = 40697161 is a prime.

It is a super-2 number, since 2×40699209² = 3312851226451362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40699229) 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 15 ways as a sum of consecutive naturals, for example, 58554 + ... + 59244.

It is an arithmetic number, because the mean of its divisors is an integer number (3518820).

Almost surely, 2^40699209 is an apocalyptic number.

It is an amenable number.

40699209 is a deficient number, since it is larger than the sum of its proper divisors (15601911).

40699209 is a wasteful number, since it uses less digits than its factorization.

40699209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 40699209 is about 6379.5931688471. The cubic root of 40699209 is about 343.9764073643.

The spelling of 40699209 in words is "forty million, six hundred ninety-nine thousand, two hundred nine".