990604421 has 4 divisors (see below), whose sum is σ = 996536352. Its totient is φ = 984672492.

The previous prime is 990604369. The next prime is 990604469. The reversal of 990604421 is 124406099.

990604421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124406099 = 37 ⋅3362327.

It is a cyclic number.

It is not a de Polignac number, because 990604421 - 2⁶ = 990604357 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 (990603421) 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, 2965715 + ... + 2966048.

It is an arithmetic number, because the mean of its divisors is an integer number (249134088).

Almost surely, 2^990604421 is an apocalyptic number.

It is an amenable number.

990604421 is a deficient number, since it is larger than the sum of its proper divisors (5931931).

990604421 is a wasteful number, since it uses less digits than its factorization.

990604421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931930.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 990604421 is about 31473.8688597382. The cubic root of 990604421 is about 996.8582802671.

The spelling of 990604421 in words is "nine hundred ninety million, six hundred four thousand, four hundred twenty-one".