990429405 has 48 divisors (see below), whose sum is σ = 1854679680. Its totient is φ = 450000768.

The previous prime is 990429403. The next prime is 990429409. The reversal of 990429405 is 504924099.

It is not a de Polignac number, because 990429405 - 2¹ = 990429403 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990429403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118711 + ... + 126779.

It is an arithmetic number, because the mean of its divisors is an integer number (38639160).

Almost surely, 2^990429405 is an apocalyptic number.

It is an amenable number.

990429405 is a deficient number, since it is larger than the sum of its proper divisors (864250275).

990429405 is a wasteful number, since it uses less digits than its factorization.

990429405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258 (or 8251 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 990429405 is about 31471.0883987192. The cubic root of 990429405 is about 996.7995698405.

The spelling of 990429405 in words is "nine hundred ninety million, four hundred twenty-nine thousand, four hundred five".