3891120 has 80 divisors (see below), whose sum is σ = 12475392. Its totient is φ = 1002240.

The previous prime is 3891103. The next prime is 3891131. The reversal of 3891120 is 211983.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7179 + ... + 7701.

Almost surely, 2^3891120 is an apocalyptic number.

3891120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3891120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6237696).

3891120 is an abundant number, since it is smaller than the sum of its proper divisors (8584272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3891120 is a wasteful number, since it uses less digits than its factorization.

3891120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3891120 is about 1972.5922031682. The cubic root of 3891120 is about 157.2865336882.

The spelling of 3891120 in words is "three million, eight hundred ninety-one thousand, one hundred twenty".