40213720 has 32 divisors (see below), whose sum is σ = 93603600. Its totient is φ = 15530368.

The previous prime is 40213681. The next prime is 40213753. The reversal of 40213720 is 2731204.

40213720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 16174 + ... + 18493.

Almost surely, 2^40213720 is an apocalyptic number.

40213720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40213720 is an abundant number, since it is smaller than the sum of its proper divisors (53389880).

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

40213720 is a wasteful number, since it uses less digits than its factorization.

40213720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34707 (or 34703 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 40213720 is about 6341.4288610691. The cubic root of 40213720 is about 342.6032011808.

Adding to 40213720 its reverse (2731204), we get a palindrome (42944924).

The spelling of 40213720 in words is "forty million, two hundred thirteen thousand, seven hundred twenty".