1989706403 has 4 divisors (see below), whose sum is σ = 2014892640. Its totient is φ = 1964520168.

The previous prime is 1989706399. The next prime is 1989706417. The reversal of 1989706403 is 3046079891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3046079891 = 16619 ⋅183289.

It is a cyclic number.

It is not a de Polignac number, because 1989706403 - 2² = 1989706399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989706423) 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, 12593000 + ... + 12593157.

It is an arithmetic number, because the mean of its divisors is an integer number (503723160).

Almost surely, 2^1989706403 is an apocalyptic number.

1989706403 is a deficient number, since it is larger than the sum of its proper divisors (25186237).

1989706403 is an equidigital number, since it uses as much as digits as its factorization.

1989706403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25186236.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1989706403 is about 44606.1251735678. The cubic root of 1989706403 is about 1257.7558110293.

The spelling of 1989706403 in words is "one billion, nine hundred eighty-nine million, seven hundred six thousand, four hundred three".