40197906 has 24 divisors (see below), whose sum is σ = 99537984. Its totient is φ = 11485080.

The previous prime is 40197889. The next prime is 40197907. The reversal of 40197906 is 60979104.

40197906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40197907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159390 + ... + 159641.

It is an arithmetic number, because the mean of its divisors is an integer number (4147416).

Almost surely, 2^40197906 is an apocalyptic number.

40197906 is an abundant number, since it is smaller than the sum of its proper divisors (59340078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40197906 is a wasteful number, since it uses less digits than its factorization.

40197906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319046 (or 319043 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 40197906 is about 6340.1818585905. The cubic root of 40197906 is about 342.5582858519.

The spelling of 40197906 in words is "forty million, one hundred ninety-seven thousand, nine hundred six".