99390649 has 4 divisors (see below), whose sum is σ = 99581940. Its totient is φ = 99199360.

The previous prime is 99390631. The next prime is 99390671. The reversal of 99390649 is 94609399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44156025 + 55234624 = 6645^2 + 7432^2 .

It is a cyclic number.

It is not a de Polignac number, because 99390649 - 2¹⁷ = 99259577 is a prime.

It is a super-2 number, since 2×99390649² = 19757002217282402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99390689) 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, 94864 + ... + 95905.

It is an arithmetic number, because the mean of its divisors is an integer number (24895485).

Almost surely, 2^99390649 is an apocalyptic number.

It is an amenable number.

99390649 is a deficient number, since it is larger than the sum of its proper divisors (191291).

99390649 is a wasteful number, since it uses less digits than its factorization.

99390649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191290.

The product of its (nonzero) digits is 472392, while the sum is 49.

The square root of 99390649 is about 9969.4858944682. The cubic root of 99390649 is about 463.2141762952.

The spelling of 99390649 in words is "ninety-nine million, three hundred ninety thousand, six hundred forty-nine".