3891870 has 48 divisors (see below), whose sum is σ = 10260432. Its totient is φ = 1023360.

The previous prime is 3891869. The next prime is 3891871. The reversal of 3891870 is 781983.

It is an interprime number because it is at equal distance from previous prime (3891869) and next prime (3891871).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7210 + ... + 7730.

It is an arithmetic number, because the mean of its divisors is an integer number (213759).

Almost surely, 2^3891870 is an apocalyptic number.

3891870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3891870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5130216).

3891870 is an abundant number, since it is smaller than the sum of its proper divisors (6368562).

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

3891870 is a wasteful number, since it uses less digits than its factorization.

3891870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 3891870 is about 1972.7822991907. The cubic root of 3891870 is about 157.2966385185.

It can be divided in two parts, 3891 and 870, that added together give a square (4761 = 69²).

The spelling of 3891870 in words is "three million, eight hundred ninety-one thousand, eight hundred seventy".