3722421 has 4 divisors (see below), whose sum is σ = 4963232. Its totient is φ = 2481612.

The previous prime is 3722419. The next prime is 3722437. The reversal of 3722421 is 1242273.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3722421 - 2¹ = 3722419 is a prime.

It is a D-number.

It is a Duffinian number.

3722421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3722491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620401 + ... + 620406.

It is an arithmetic number, because the mean of its divisors is an integer number (1240808).

Almost surely, 2^3722421 is an apocalyptic number.

It is an amenable number.

3722421 is a deficient number, since it is larger than the sum of its proper divisors (1240811).

3722421 is a wasteful number, since it uses less digits than its factorization.

3722421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240810.

The product of its digits is 672, while the sum is 21.

The square root of 3722421 is about 1929.3576651311. The cubic root of 3722421 is about 154.9798239434.

Adding to 3722421 its reverse (1242273), we get a palindrome (4964694).

The spelling of 3722421 in words is "three million, seven hundred twenty-two thousand, four hundred twenty-one".