40198609 has 4 divisors (see below), whose sum is σ = 43853040. Its totient is φ = 36544180.

The previous prime is 40198607. The next prime is 40198621. The reversal of 40198609 is 90689104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40198609 - 2¹ = 40198607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40198607) 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, 1827199 + ... + 1827220.

It is an arithmetic number, because the mean of its divisors is an integer number (10963260).

Almost surely, 2^40198609 is an apocalyptic number.

It is an amenable number.

40198609 is a deficient number, since it is larger than the sum of its proper divisors (3654431).

40198609 is a wasteful number, since it uses less digits than its factorization.

40198609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654430.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40198609 is about 6340.2372983982. The cubic root of 40198609 is about 342.5602827807.

The spelling of 40198609 in words is "forty million, one hundred ninety-eight thousand, six hundred nine".