4991640 has 32 divisors (see below), whose sum is σ = 14975280. Its totient is φ = 1331072.

The previous prime is 4991617. The next prime is 4991647. The reversal of 4991640 is 461994.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20679 + ... + 20918.

Almost surely, 2^4991640 is an apocalyptic number.

4991640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4991640 is an abundant number, since it is smaller than the sum of its proper divisors (9983640).

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

4991640 is a wasteful number, since it uses less digits than its factorization.

4991640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41611 (or 41607 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 4991640 is about 2234.1978426272. The cubic root of 4991640 is about 170.9022388435.

The spelling of 4991640 in words is "four million, nine hundred ninety-one thousand, six hundred forty".