3920428 has 6 divisors (see below), whose sum is σ = 6860756. Its totient is φ = 1960212.

The previous prime is 3920417. The next prime is 3920429. The reversal of 3920428 is 8240293.

It is a junction number, because it is equal to n+sod(n) for n = 3920396 and 3920405.

It is not an unprimeable number, because it can be changed into a prime (3920429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490050 + ... + 490057.

Almost surely, 2^3920428 is an apocalyptic number.

It is an amenable number.

3920428 is a deficient number, since it is larger than the sum of its proper divisors (2940328).

3920428 is a wasteful number, since it uses less digits than its factorization.

3920428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980111 (or 980109 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 3920428 is about 1980.0070706944. The cubic root of 3920428 is about 157.6804415544.

Subtracting from 3920428 its sum of digits (28), we obtain a square (3920400 = 1980²).

The spelling of 3920428 in words is "three million, nine hundred twenty thousand, four hundred twenty-eight".