39643428 has 48 divisors (see below), whose sum is σ = 103650624. Its totient is φ = 11687040.

The previous prime is 39643403. The next prime is 39643501. The reversal of 39643428 is 82434693.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826 + ... + 8942.

It is an arithmetic number, because the mean of its divisors is an integer number (2159388).

Almost surely, 2^39643428 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 39643428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51825312).

39643428 is an abundant number, since it is smaller than the sum of its proper divisors (64007196).

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

39643428 is a wasteful number, since it uses less digits than its factorization.

39643428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172 (or 8170 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 39643428 is about 6296.3027246155. The cubic root of 39643428 is about 340.9759387683.

The spelling of 39643428 in words is "thirty-nine million, six hundred forty-three thousand, four hundred twenty-eight".