3921225 has 72 divisors (see below), whose sum is σ = 8311968. Its totient is φ = 1612800.

The previous prime is 3921217. The next prime is 3921227. The reversal of 3921225 is 5221293.

3921225 is a nontrivial binomial coefficient, being equal to C(100, 4).

It is not a de Polignac number, because 3921225 - 2³ = 3921217 is a prime.

Its product of digits (1080) is a multiple of the sum of its prime factors (135).

It is a Curzon number.

3921225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3921195 and 3921204.

It is not an unprimeable number, because it can be changed into a prime (3921227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40377 + ... + 40473.

It is an arithmetic number, because the mean of its divisors is an integer number (115444).

Almost surely, 2^3921225 is an apocalyptic number.

3921225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3921225 is the 1617-th pentagonal number.

It is an amenable number.

3921225 is an abundant number, since it is smaller than the sum of its proper divisors (4390743).

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

3921225 is a wasteful number, since it uses less digits than its factorization.

3921225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 123 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 3921225 is about 1980.2083223742. The cubic root of 3921225 is about 157.6911259998.

The spelling of 3921225 in words is "three million, nine hundred twenty-one thousand, two hundred twenty-five".