990739 has 4 divisors (see below), whose sum is σ = 1003360. Its totient is φ = 978120.

The previous prime is 990733. The next prime is 990761. The reversal of 990739 is 937099.

It is a happy number.

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 990739 - 2⁵ = 990707 is a prime.

It is a super-2 number, since 2×990739² = 1963127532242, which contains 22 as substring.

It is a Duffinian number.

990739 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 990698 and 990707.

It is not an unprimeable number, because it can be changed into a prime (990733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6192 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (250840).

2⁹⁹⁰⁷³⁹ is an apocalyptic number.

990739 is a deficient number, since it is larger than the sum of its proper divisors (12621).

990739 is a wasteful number, since it uses less digits than its factorization.

990739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12620.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 990739 is about 995.3587293032. The cubic root of 990739 is about 99.6903421097.

The spelling of 990739 in words is "nine hundred ninety thousand, seven hundred thirty-nine".