40428240 has 40 divisors (see below), whose sum is σ = 125328288. Its totient is φ = 10780800.

The previous prime is 40428239. The next prime is 40428251. The reversal of 40428240 is 4282404.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40428240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83986 + ... + 84465.

Almost surely, 2^40428240 is an apocalyptic number.

40428240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40428240 is an abundant number, since it is smaller than the sum of its proper divisors (84900048).

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

40428240 is a wasteful number, since it uses less digits than its factorization.

40428240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168467 (or 168461 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 40428240 is about 6358.3205329710. The cubic root of 40428240 is about 343.2113264501.

The spelling of 40428240 in words is "forty million, four hundred twenty-eight thousand, two hundred forty".