4491972 has 18 divisors (see below), whose sum is σ = 11354798. Its totient is φ = 1497312.

The previous prime is 4491953. The next prime is 4491989. The reversal of 4491972 is 2791944.

It can be written as a sum of positive squares in only one way, i.e., 4064256 + 427716 = 2016^2 + 654^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 124777 = 4491972 / (4 + 4 + 9 + 1 + 9 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62353 + ... + 62424.

Almost surely, 2^4491972 is an apocalyptic number.

It is an amenable number.

4491972 is an abundant number, since it is smaller than the sum of its proper divisors (6862826).

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

4491972 is a wasteful number, since it uses less digits than its factorization.

4491972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124787 (or 124782 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 4491972 is about 2119.4272811304. The cubic root of 4491972 is about 164.9981267005.

The spelling of 4491972 in words is "four million, four hundred ninety-one thousand, nine hundred seventy-two".