990415439 has 8 divisors (see below), whose sum is σ = 1070455680. Its totient is φ = 910925856.

The previous prime is 990415429. The next prime is 990415457. The reversal of 990415439 is 934514099.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990415439 - 2²⁰ = 989366863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990415439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990415409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133919 + ... + 141120.

It is an arithmetic number, because the mean of its divisors is an integer number (133806960).

Almost surely, 2^990415439 is an apocalyptic number.

990415439 is a deficient number, since it is larger than the sum of its proper divisors (80040241).

990415439 is a wasteful number, since it uses less digits than its factorization.

990415439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275329.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 990415439 is about 31470.8665117438. The cubic root of 990415439 is about 996.7948845434.

The spelling of 990415439 in words is "nine hundred ninety million, four hundred fifteen thousand, four hundred thirty-nine".