998738729 has 8 divisors (see below), whose sum is σ = 1103466240. Its totient is φ = 899119936.

The previous prime is 998738717. The next prime is 998738737. The reversal of 998738729 is 927837899.

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

It is not a de Polignac number, because 998738729 - 2⁸ = 998738473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (998731729) 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, 1276769 + ... + 1277550.

It is an arithmetic number, because the mean of its divisors is an integer number (137933280).

Almost surely, 2^998738729 is an apocalyptic number.

It is an amenable number.

998738729 is a deficient number, since it is larger than the sum of its proper divisors (104727511).

998738729 is a wasteful number, since it uses less digits than its factorization.

998738729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554359.

The product of its digits is 13716864, while the sum is 62.

The square root of 998738729 is about 31602.8278639745. The cubic root of 998738729 is about 999.5793994533.

The spelling of 998738729 in words is "nine hundred ninety-eight million, seven hundred thirty-eight thousand, seven hundred twenty-nine".