40297890 has 16 divisors (see below), whose sum is σ = 96715008. Its totient is φ = 10746096.

The previous prime is 40297877. The next prime is 40297891. The reversal of 40297890 is 9879204.

40297890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (40297891) 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 7 ways as a sum of consecutive naturals, for example, 671602 + ... + 671661.

It is an arithmetic number, because the mean of its divisors is an integer number (6044688).

Almost surely, 2^40297890 is an apocalyptic number.

40297890 is an abundant number, since it is smaller than the sum of its proper divisors (56417118).

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

40297890 is a wasteful number, since it uses less digits than its factorization.

40297890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343273.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 40297890 is about 6348.0619089609. The cubic root of 40297890 is about 342.8420650611.

The spelling of 40297890 in words is "forty million, two hundred ninety-seven thousand, eight hundred ninety".