3920425 has 6 divisors (see below), whose sum is σ = 4861358. Its totient is φ = 3136320.

The previous prime is 3920417. The next prime is 3920429. The reversal of 3920425 is 5240293.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1401856 + 2518569 = 1184^2 + 1587^2 .

It is not a de Polignac number, because 3920425 - 2³ = 3920417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 156817 = 3920425 / (3 + 9 + 2 + 0 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3920425.

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 in 5 ways as a sum of consecutive naturals, for example, 78384 + ... + 78433.

Almost surely, 2^3920425 is an apocalyptic number.

It is an amenable number.

3920425 is a deficient number, since it is larger than the sum of its proper divisors (940933).

3920425 is a wasteful number, since it uses less digits than its factorization.

3920425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156827 (or 156822 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 3920425 is about 1980.0063131212. The cubic root of 3920425 is about 157.6804013342.

Subtracting from 3920425 its sum of digits (25), we obtain a square (3920400 = 1980²).

It can be divided in two parts, 39204 and 25, that multiplied together give a square (980100 = 990²).

The spelling of 3920425 in words is "three million, nine hundred twenty thousand, four hundred twenty-five".