3971830 has 8 divisors (see below), whose sum is σ = 7149312. Its totient is φ = 1588728.

The previous prime is 3971809. The next prime is 3971833. The reversal of 3971830 is 381793.

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 = 3971792 and 3971801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971833) 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, 198582 + ... + 198601.

It is an arithmetic number, because the mean of its divisors is an integer number (893664).

Almost surely, 2^3971830 is an apocalyptic number.

3971830 is a deficient number, since it is larger than the sum of its proper divisors (3177482).

3971830 is a wasteful number, since it uses less digits than its factorization.

3971830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397190.

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

The square root of 3971830 is about 1992.9450569446. The cubic root of 3971830 is about 158.3665845831.

The spelling of 3971830 in words is "three million, nine hundred seventy-one thousand, eight hundred thirty".