990199750 has 16 divisors (see below), whose sum is σ = 1853654400. Its totient is φ = 396079800.

The previous prime is 990199741. The next prime is 990199757. The reversal of 990199750 is 57991099.

It is a junction number, because it is equal to n+sod(n) for n = 990199694 and 990199703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990199757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1980150 + ... + 1980649.

It is an arithmetic number, because the mean of its divisors is an integer number (115853400).

Almost surely, 2^990199750 is an apocalyptic number.

990199750 is a deficient number, since it is larger than the sum of its proper divisors (863454650).

990199750 is a wasteful number, since it uses less digits than its factorization.

990199750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960816 (or 3960806 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 990199750 is about 31467.4395208762. The cubic root of 990199750 is about 996.7225198594.

The spelling of 990199750 in words is "nine hundred ninety million, one hundred ninety-nine thousand, seven hundred fifty".