1689333977 has 4 divisors (see below), whose sum is σ = 1696402560. Its totient is φ = 1682265396.

The previous prime is 1689333941. The next prime is 1689333983. The reversal of 1689333977 is 7793339861.

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 a de Polignac number, because none of the positive numbers 2^k-1689333977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689333907) 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, 3533933 + ... + 3534410.

It is an arithmetic number, because the mean of its divisors is an integer number (424100640).

Almost surely, 2^1689333977 is an apocalyptic number.

It is an amenable number.

1689333977 is a deficient number, since it is larger than the sum of its proper divisors (7068583).

1689333977 is an equidigital number, since it uses as much as digits as its factorization.

1689333977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7068582.

The product of its digits is 5143824, while the sum is 56.

The square root of 1689333977 is about 41101.5082083371. The cubic root of 1689333977 is about 1190.9819301618.

The spelling of 1689333977 in words is "one billion, six hundred eighty-nine million, three hundred thirty-three thousand, nine hundred seventy-seven".