40209259 has 4 divisors (see below), whose sum is σ = 40228480. Its totient is φ = 40190040.

The previous prime is 40209251. The next prime is 40209293. The reversal of 40209259 is 95290204.

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 40209259 - 2³ = 40209251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40209259.

It is not an unprimeable number, because it can be changed into a prime (40209251) 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, 6027 + ... + 10804.

It is an arithmetic number, because the mean of its divisors is an integer number (10057120).

Almost surely, 2^40209259 is an apocalyptic number.

40209259 is a deficient number, since it is larger than the sum of its proper divisors (19221).

40209259 is a wasteful number, since it uses less digits than its factorization.

40209259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19220.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 40209259 is about 6341.0771167050. The cubic root of 40209259 is about 342.5905321265.

The spelling of 40209259 in words is "forty million, two hundred nine thousand, two hundred fifty-nine".