3742021 has 4 divisors (see below), whose sum is σ = 3750912. Its totient is φ = 3733132.

The previous prime is 3742009. The next prime is 3742033. The reversal of 3742021 is 1202473.

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 an interprime number because it is at equal distance from previous prime (3742009) and next prime (3742033).

It is a cyclic number.

It is not a de Polignac number, because 3742021 - 2¹⁷ = 3610949 is a prime.

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 3742021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3742051) 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, 3781 + ... + 4666.

It is an arithmetic number, because the mean of its divisors is an integer number (937728).

Almost surely, 2^3742021 is an apocalyptic number.

It is an amenable number.

3742021 is a deficient number, since it is larger than the sum of its proper divisors (8891).

3742021 is an equidigital number, since it uses as much as digits as its factorization.

3742021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8890.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 3742021 is about 1934.4304071225. The cubic root of 3742021 is about 155.2513576844.

Adding to 3742021 its reverse (1202473), we get a palindrome (4944494).

The spelling of 3742021 in words is "three million, seven hundred forty-two thousand, twenty-one".