3891204947 has 4 divisors (see below), whose sum is σ = 4447091376. Its totient is φ = 3335318520.

The previous prime is 3891204931. The next prime is 3891204973. The reversal of 3891204947 is 7494021983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3891204947 - 2⁴ = 3891204931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3891204347) 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, 277943204 + ... + 277943217.

It is an arithmetic number, because the mean of its divisors is an integer number (1111772844).

Almost surely, 2^3891204947 is an apocalyptic number.

3891204947 is a deficient number, since it is larger than the sum of its proper divisors (555886429).

3891204947 is an equidigital number, since it uses as much as digits as its factorization.

3891204947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555886428.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 3891204947 is about 62379.5234592250. The cubic root of 3891204947 is about 1572.8767825345.

The spelling of 3891204947 in words is "three billion, eight hundred ninety-one million, two hundred four thousand, nine hundred forty-seven".