990973439 has 4 divisors (see below), whose sum is σ = 992276400. Its totient is φ = 989670480.

The previous prime is 990973433. The next prime is 990973447. The reversal of 990973439 is 934379099.

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 990973439 - 2¹⁶ = 990907903 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 (990973433) 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, 650339 + ... + 651860.

It is an arithmetic number, because the mean of its divisors is an integer number (248069100).

Almost surely, 2^990973439 is an apocalyptic number.

990973439 is a deficient number, since it is larger than the sum of its proper divisors (1302961).

990973439 is a wasteful number, since it uses less digits than its factorization.

990973439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302960.

The product of its (nonzero) digits is 1653372, while the sum is 53.

The square root of 990973439 is about 31479.7306055817. The cubic root of 990973439 is about 996.9820474583.

The spelling of 990973439 in words is "nine hundred ninety million, nine hundred seventy-three thousand, four hundred thirty-nine".