39705228 has 36 divisors (see below), whose sum is σ = 104085800. Its totient is φ = 13234752.

The previous prime is 39705223. The next prime is 39705241. The reversal of 39705228 is 82250793.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 39705192 and 39705201.

It is not an unprimeable number, because it can be changed into a prime (39705223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19453 + ... + 21396.

Almost surely, 2^39705228 is an apocalyptic number.

It is an amenable number.

39705228 is an abundant number, since it is smaller than the sum of its proper divisors (64380572).

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

39705228 is a wasteful number, since it uses less digits than its factorization.

39705228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40868 (or 40854 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 39705228 is about 6301.2084555266. The cubic root of 39705228 is about 341.1530288410.

The spelling of 39705228 in words is "thirty-nine million, seven hundred five thousand, two hundred twenty-eight".