40420340 has 12 divisors (see below), whose sum is σ = 84882756. Its totient is φ = 16168128.

The previous prime is 40420337. The next prime is 40420349. The reversal of 40420340 is 4302404.

40420340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 18028516 = 4732^2 + 4246^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420349) 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 3 ways as a sum of consecutive naturals, for example, 1010489 + ... + 1010528.

It is an arithmetic number, because the mean of its divisors is an integer number (7073563).

Almost surely, 2^40420340 is an apocalyptic number.

It is an amenable number.

40420340 is an abundant number, since it is smaller than the sum of its proper divisors (44462416).

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

40420340 is a wasteful number, since it uses less digits than its factorization.

40420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021026 (or 2021024 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40420340 is about 6357.6992693898. The cubic root of 40420340 is about 343.1889695852.

Adding to 40420340 its reverse (4302404), we get a palindrome (44722744).

The spelling of 40420340 in words is "forty million, four hundred twenty thousand, three hundred forty".