3891123 has 12 divisors (see below), whose sum is σ = 5689320. Its totient is φ = 2562336.

The previous prime is 3891103. The next prime is 3891131. The reversal of 3891123 is 3211983.

It is not a de Polignac number, because 3891123 - 2²¹ = 1793971 is a prime.

It is a super-2 number, since 2×3891123² = 30281676402258, which contains 22 as substring.

It is an Ulam number.

3891123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3891103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1858 + ... + 3351.

It is an arithmetic number, because the mean of its divisors is an integer number (474110).

Almost surely, 2^3891123 is an apocalyptic number.

3891123 is a deficient number, since it is larger than the sum of its proper divisors (1798197).

3891123 is a wasteful number, since it uses less digits than its factorization.

3891123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298 (or 5295 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3891123 is about 1972.5929635888. The cubic root of 3891123 is about 157.2865741101.

The spelling of 3891123 in words is "three million, eight hundred ninety-one thousand, one hundred twenty-three".