3745821 has 8 divisors (see below), whose sum is σ = 5007744. Its totient is φ = 2490560.

The previous prime is 3745813. The next prime is 3745829. The reversal of 3745821 is 1285473.

It is an interprime number because it is at equal distance from previous prime (3745813) and next prime (3745829).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3745821 - 2³ = 3745813 is a prime.

It is an Ulam number.

3745821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3745829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (625968).

Almost surely, 2^3745821 is an apocalyptic number.

It is an amenable number.

3745821 is a deficient number, since it is larger than the sum of its proper divisors (1261923).

3745821 is a wasteful number, since it uses less digits than its factorization.

3745821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331.

The product of its digits is 6720, while the sum is 30.

The square root of 3745821 is about 1935.4123591628. The cubic root of 3745821 is about 155.3038921814.

The spelling of 3745821 in words is "three million, seven hundred forty-five thousand, eight hundred twenty-one".