40197091 has 16 divisors (see below), whose sum is σ = 44862048. Its totient is φ = 35712000.

The previous prime is 40197029. The next prime is 40197107. The reversal of 40197091 is 19079104.

It is a cyclic number.

It is not a de Polignac number, because 40197091 - 2¹⁵ = 40164323 is a prime.

It is a super-2 number, since 2×40197091² = 3231612249724562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40197191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107581 + ... + 107953.

It is an arithmetic number, because the mean of its divisors is an integer number (2803878).

Almost surely, 2^40197091 is an apocalyptic number.

40197091 is a deficient number, since it is larger than the sum of its proper divisors (4664957).

40197091 is a wasteful number, since it uses less digits than its factorization.

40197091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 40197091 is about 6340.1175856604. The cubic root of 40197091 is about 342.5559707488. Note that the first 3 decimals are identical.

The spelling of 40197091 in words is "forty million, one hundred ninety-seven thousand, ninety-one".