4991988 has 12 divisors (see below), whose sum is σ = 11648000. Its totient is φ = 1663992.

The previous prime is 4991983. The next prime is 4992007. The reversal of 4991988 is 8891994.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207988 + ... + 208011.

Almost surely, 2^4991988 is an apocalyptic number.

It is an amenable number.

4991988 is an abundant number, since it is smaller than the sum of its proper divisors (6656012).

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

4991988 is a wasteful number, since it uses less digits than its factorization.

4991988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416006 (or 416004 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 4991988 is about 2234.2757215706. The cubic root of 4991988 is about 170.9062103236.

The spelling of 4991988 in words is "four million, nine hundred ninety-one thousand, nine hundred eighty-eight".