4990640 has 20 divisors (see below), whose sum is σ = 11603424. Its totient is φ = 1996224.

The previous prime is 4990637. The next prime is 4990649. The reversal of 4990640 is 460994.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 4990597 and 4990606.

It is not an unprimeable number, because it can be changed into a prime (4990649) 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, 31112 + ... + 31271.

Almost surely, 2^4990640 is an apocalyptic number.

4990640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4990640 is an abundant number, since it is smaller than the sum of its proper divisors (6612784).

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

4990640 is a wasteful number, since it uses less digits than its factorization.

4990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62396 (or 62390 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 4990640 is about 2233.9740374499. The cubic root of 4990640 is about 170.8908255169.

The spelling of 4990640 in words is "four million, nine hundred ninety thousand, six hundred forty".