9990730 has 24 divisors (see below), whose sum is σ = 19108908. Its totient is φ = 3760128.

The previous prime is 9990727. The next prime is 9990731. The reversal of 9990730 is 370999.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3924361 + 6066369 = 1981^2 + 2463^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9990730.

It is not an unprimeable number, because it can be changed into a prime (9990731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1162 + ... + 4618.

Almost surely, 2^9990730 is an apocalyptic number.

9990730 is a deficient number, since it is larger than the sum of its proper divisors (9118178).

9990730 is a wasteful number, since it uses less digits than its factorization.

9990730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3481 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 9990730 is about 3160.8116046357. The cubic root of 9990730 is about 215.3768763899.

The spelling of 9990730 in words is "nine million, nine hundred ninety thousand, seven hundred thirty".