3750021 has 12 divisors (see below), whose sum is σ = 5909280. Its totient is φ = 2272680.

The previous prime is 3750017. The next prime is 3750031. The reversal of 3750021 is 1200573.

It is not a de Polignac number, because 3750021 - 2² = 3750017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3749976 and 3750003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3750001) 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, 18841 + ... + 19038.

It is an arithmetic number, because the mean of its divisors is an integer number (492440).

Almost surely, 2^3750021 is an apocalyptic number.

It is an amenable number.

3750021 is a deficient number, since it is larger than the sum of its proper divisors (2159259).

3750021 is a wasteful number, since it uses less digits than its factorization.

3750021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37896 (or 37893 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 3750021 is about 1936.4970952728. The cubic root of 3750021 is about 155.3619153055.

Adding to 3750021 its reverse (1200573), we get a palindrome (4950594).

The spelling of 3750021 in words is "three million, seven hundred fifty thousand, twenty-one".