1998929 has 4 divisors (see below), whose sum is σ = 2014320. Its totient is φ = 1983540.

The previous prime is 1998923. The next prime is 1998943. The reversal of 1998929 is 9298991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1998929 - 2¹² = 1994833 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 (1998923) 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, 7499 + ... + 7760.

It is an arithmetic number, because the mean of its divisors is an integer number (503580).

2^1998929 is an apocalyptic number.

It is an amenable number.

1998929 is a deficient number, since it is larger than the sum of its proper divisors (15391).

1998929 is a wasteful number, since it uses less digits than its factorization.

1998929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15390.

The product of its digits is 104976, while the sum is 47.

The square root of 1998929 is about 1413.8348559857. The cubic root of 1998929 is about 125.9696113832.

The spelling of 1998929 in words is "one million, nine hundred ninety-eight thousand, nine hundred twenty-nine".