4991870 has 64 divisors (see below), whose sum is σ = 10644480. Its totient is φ = 1669248.

The previous prime is 4991867. The next prime is 4991879. The reversal of 4991870 is 781994.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991879) 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 31 ways as a sum of consecutive naturals, for example, 106187 + ... + 106233.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

Almost surely, 2^4991870 is an apocalyptic number.

4991870 is an abundant number, since it is smaller than the sum of its proper divisors (5652610).

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

4991870 is a wasteful number, since it uses less digits than its factorization.

4991870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 4991870 is about 2234.2493146469. The cubic root of 4991870 is about 170.9048636930.

It can be divided in two parts, 49 and 91870, that added together give a palindrome (91919).

The spelling of 4991870 in words is "four million, nine hundred ninety-one thousand, eight hundred seventy".