3747821 has 8 divisors (see below), whose sum is σ = 4672704. Its totient is φ = 2920320.

The previous prime is 3747811. The next prime is 3747823. The reversal of 3747821 is 1287473.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3747821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3747823) 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, 24260 + ... + 24413.

It is an arithmetic number, because the mean of its divisors is an integer number (584088).

Almost surely, 2^3747821 is an apocalyptic number.

It is an amenable number.

3747821 is a deficient number, since it is larger than the sum of its proper divisors (924883).

3747821 is a wasteful number, since it uses less digits than its factorization.

3747821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48691.

The product of its digits is 9408, while the sum is 32.

The square root of 3747821 is about 1935.9289759699. The cubic root of 3747821 is about 155.3315276468.

The spelling of 3747821 in words is "three million, seven hundred forty-seven thousand, eight hundred twenty-one".