3907728 has 60 divisors (see below), whose sum is σ = 11935248. Its totient is φ = 1183680.

The previous prime is 3907727. The next prime is 3907733. The reversal of 3907728 is 8277093.

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 = 3907692 and 3907701.

It is not an unprimeable number, because it can be changed into a prime (3907727) 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, 351 + ... + 2817.

Almost surely, 2^3907728 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 3907728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5967624).

3907728 is an abundant number, since it is smaller than the sum of its proper divisors (8027520).

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

3907728 is a wasteful number, since it uses less digits than its factorization.

3907728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492 (or 2483 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 3907728 is about 1976.7974099538. The cubic root of 3907728 is about 157.5099918075.

It can be divided in two parts, 390 and 7728, that added together give a palindrome (8118).

The spelling of 3907728 in words is "three million, nine hundred seven thousand, seven hundred twenty-eight".