40909428 has 96 divisors (see below), whose sum is σ = 123621120. Its totient is φ = 11456640.

The previous prime is 40909423. The next prime is 40909447. The reversal of 40909428 is 82490904.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40909392 and 40909401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40909423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39558 + ... + 40578.

It is an arithmetic number, because the mean of its divisors is an integer number (1287720).

Almost surely, 2^40909428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40909428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61810560).

40909428 is an abundant number, since it is smaller than the sum of its proper divisors (82711692).

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

40909428 is a wasteful number, since it uses less digits than its factorization.

40909428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 40909428 is about 6396.0478422226. The cubic root of 40909428 is about 344.5676246986.

The spelling of 40909428 in words is "forty million, nine hundred nine thousand, four hundred twenty-eight".