990609407 has 4 divisors (see below), whose sum is σ = 992141136. Its totient is φ = 989077680.

The previous prime is 990609391. The next prime is 990609419. The reversal of 990609407 is 704906099.

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

It is a cyclic number.

It is not a de Polignac number, because 990609407 - 2⁴ = 990609391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990609497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764894 + ... + 766187.

It is an arithmetic number, because the mean of its divisors is an integer number (248035284).

Almost surely, 2^990609407 is an apocalyptic number.

990609407 is a deficient number, since it is larger than the sum of its proper divisors (1531729).

990609407 is a wasteful number, since it uses less digits than its factorization.

990609407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531728.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 990609407 is about 31473.9480682040. The cubic root of 990609407 is about 996.8599527568.

The spelling of 990609407 in words is "nine hundred ninety million, six hundred nine thousand, four hundred seven".