1689901994 has 8 divisors (see below), whose sum is σ = 2765294208. Its totient is φ = 768137260.

The previous prime is 1689901937. The next prime is 1689902041. The reversal of 1689901994 is 4991099861.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38406842 + ... + 38406885.

It is an arithmetic number, because the mean of its divisors is an integer number (345661776).

Almost surely, 2^1689901994 is an apocalyptic number.

1689901994 is a deficient number, since it is larger than the sum of its proper divisors (1075392214).

1689901994 is a wasteful number, since it uses less digits than its factorization.

1689901994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76813740.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The square root of 1689901994 is about 41108.4175565054. The cubic root of 1689901994 is about 1191.1153993642.

The spelling of 1689901994 in words is "one billion, six hundred eighty-nine million, nine hundred one thousand, nine hundred ninety-four".