40197089 has 4 divisors (see below), whose sum is σ = 40587456. Its totient is φ = 39806724.

The previous prime is 40197029. The next prime is 40197107. The reversal of 40197089 is 98079104.

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 40197089 - 2⁸ = 40196833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40197029) 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, 195029 + ... + 195234.

It is an arithmetic number, because the mean of its divisors is an integer number (10146864).

Almost surely, 2^40197089 is an apocalyptic number.

It is an amenable number.

40197089 is a deficient number, since it is larger than the sum of its proper divisors (390367).

40197089 is a wasteful number, since it uses less digits than its factorization.

40197089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390366.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 40197089 is about 6340.1174279346. The cubic root of 40197089 is about 342.5559650675. Note that the first 3 decimals are identical.

The spelling of 40197089 in words is "forty million, one hundred ninety-seven thousand, eighty-nine".