3891730 has 8 divisors (see below), whose sum is σ = 7005132. Its totient is φ = 1556688.

The previous prime is 3891721. The next prime is 3891733. The reversal of 3891730 is 371983.

It can be written as a sum of positive squares in 2 ways, for example, as 3884841 + 6889 = 1971^2 + 83^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 3891692 and 3891701.

It is not an unprimeable number, because it can be changed into a prime (3891733) 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, 194577 + ... + 194596.

Almost surely, 2^3891730 is an apocalyptic number.

3891730 is a deficient number, since it is larger than the sum of its proper divisors (3113402).

3891730 is a wasteful number, since it uses less digits than its factorization.

3891730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389180.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3891730 is about 1972.7468159903. The cubic root of 3891730 is about 157.2947523821.

The spelling of 3891730 in words is "three million, eight hundred ninety-one thousand, seven hundred thirty".