3736921 has 4 divisors (see below), whose sum is σ = 3798244. Its totient is φ = 3675600.

The previous prime is 3736877. The next prime is 3736927. The reversal of 3736921 is 1296373.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1296373 = 13 ⋅99721.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 3370896 = 605^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 3736921 - 2⁷ = 3736793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3736927) 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, 30570 + ... + 30691.

It is an arithmetic number, because the mean of its divisors is an integer number (949561).

Almost surely, 2^3736921 is an apocalyptic number.

It is an amenable number.

3736921 is a deficient number, since it is larger than the sum of its proper divisors (61323).

3736921 is an equidigital number, since it uses as much as digits as its factorization.

3736921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61322.

The product of its digits is 6804, while the sum is 31.

The square root of 3736921 is about 1933.1117401744. Note that the first 3 decimals coincide. The cubic root of 3736921 is about 155.1807949320.

The spelling of 3736921 in words is "three million, seven hundred thirty-six thousand, nine hundred twenty-one".