3772921 has 4 divisors (see below), whose sum is σ = 3779172. Its totient is φ = 3766672.

The previous prime is 3772919. The next prime is 3772981. The reversal of 3772921 is 1292773.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1292773 = 61 ⋅21193.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 1638400 = 1461^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3772921 - 2¹ = 3772919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3772981) 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 3 ways as a sum of consecutive naturals, for example, 2110 + ... + 3463.

It is an arithmetic number, because the mean of its divisors is an integer number (944793).

Almost surely, 2^3772921 is an apocalyptic number.

It is an amenable number.

3772921 is a deficient number, since it is larger than the sum of its proper divisors (6251).

3772921 is an equidigital number, since it uses as much as digits as its factorization.

3772921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6250.

The product of its digits is 5292, while the sum is 31.

The square root of 3772921 is about 1942.4008340196. The cubic root of 3772921 is about 155.6775197866.

The spelling of 3772921 in words is "three million, seven hundred seventy-two thousand, nine hundred twenty-one".