3746391021 has 24 divisors (see below), whose sum is σ = 5626018944. Its totient is φ = 2491300800.

The previous prime is 3746391001. The next prime is 3746391043. The reversal of 3746391021 is 1201936473.

3746391021 is a `hidden beast` number, since 3 + 7 + 4 + 639 + 10 + 2 + 1 = 666.

It is not a de Polignac number, because 3746391021 - 2⁶ = 3746390957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3746391001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78220 + ... + 116666.

It is an arithmetic number, because the mean of its divisors is an integer number (234417456).

Almost surely, 2^3746391021 is an apocalyptic number.

It is an amenable number.

3746391021 is a deficient number, since it is larger than the sum of its proper divisors (1879627923).

3746391021 is an equidigital number, since it uses as much as digits as its factorization.

3746391021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38863 (or 38851 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 3746391021 is about 61207.7692862597. The cubic root of 3746391021 is about 1553.1176958126.

The spelling of 3746391021 in words is "three billion, seven hundred forty-six million, three hundred ninety-one thousand, twenty-one".