40428789 has 16 divisors (see below), whose sum is σ = 57953280. Its totient is φ = 24989040.

The previous prime is 40428769. The next prime is 40428793. The reversal of 40428789 is 98782404.

It is not a de Polignac number, because 40428789 - 2⁵ = 40428757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40428789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40428709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4867 + ... + 10224.

It is an arithmetic number, because the mean of its divisors is an integer number (3622080).

Almost surely, 2^40428789 is an apocalyptic number.

It is an amenable number.

40428789 is a deficient number, since it is larger than the sum of its proper divisors (17524491).

40428789 is a wasteful number, since it uses less digits than its factorization.

40428789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15160.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 40428789 is about 6358.3637046020. The cubic root of 40428789 is about 343.2128800025.

The spelling of 40428789 in words is "forty million, four hundred twenty-eight thousand, seven hundred eighty-nine".