990415947 has 16 divisors (see below), whose sum is σ = 1373427968. Its totient is φ = 634344480.

The previous prime is 990415901. The next prime is 990415957. The reversal of 990415947 is 749514099.

It is not a de Polignac number, because 990415947 - 2¹⁶ = 990350411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990415896 and 990415905.

It is not an unprimeable number, because it can be changed into a prime (990415957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55063 + ... + 70800.

It is an arithmetic number, because the mean of its divisors is an integer number (85839248).

Almost surely, 2^990415947 is an apocalyptic number.

990415947 is a deficient number, since it is larger than the sum of its proper divisors (383012021).

990415947 is a wasteful number, since it uses less digits than its factorization.

990415947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125970.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 990415947 is about 31470.8745826995. The cubic root of 990415947 is about 996.7950549674.

The spelling of 990415947 in words is "nine hundred ninety million, four hundred fifteen thousand, nine hundred forty-seven".