990939649 has 16 divisors (see below), whose sum is σ = 1140480000. Its totient is φ = 843416784.

The previous prime is 990939641. The next prime is 990939679. The reversal of 990939649 is 946939099.

It is not a de Polignac number, because 990939649 - 2³ = 990939641 is a prime.

It is a super-2 number, since 2×990939649² = 1963922775920486402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990939593 and 990939602.

It is not an unprimeable number, because it can be changed into a prime (990939641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834234 + ... + 835420.

It is an arithmetic number, because the mean of its divisors is an integer number (71280000).

Almost surely, 2^990939649 is an apocalyptic number.

It is an amenable number.

990939649 is a deficient number, since it is larger than the sum of its proper divisors (149540351).

990939649 is a wasteful number, since it uses less digits than its factorization.

990939649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932.

The product of its (nonzero) digits is 4251528, while the sum is 58.

The square root of 990939649 is about 31479.1939064519. The cubic root of 990939649 is about 996.9707157028.

The spelling of 990939649 in words is "nine hundred ninety million, nine hundred thirty-nine thousand, six hundred forty-nine".