1688888042 has 4 divisors (see below), whose sum is σ = 2533332066. Its totient is φ = 844444020.

The previous prime is 1688888041. The next prime is 1688888057. The reversal of 1688888042 is 2408888861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1259611081 + 429276961 = 35491^2 + 20719^2 .

It is not an unprimeable number, because it can be changed into a prime (1688888041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422222009 + ... + 422222012.

Almost surely, 2^1688888042 is an apocalyptic number.

1688888042 is a deficient number, since it is larger than the sum of its proper divisors (844444024).

1688888042 is an equidigital number, since it uses as much as digits as its factorization.

1688888042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844444023.

The product of its (nonzero) digits is 1572864, while the sum is 53.

The square root of 1688888042 is about 41096.0830493613. The cubic root of 1688888042 is about 1190.8771260846.

The spelling of 1688888042 in words is "one billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, forty-two".