1688040140 has 12 divisors (see below), whose sum is σ = 3544884336. Its totient is φ = 675216048.

The previous prime is 1688040131. The next prime is 1688040187. The reversal of 1688040140 is 410408861.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1688040097 and 1688040106.

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, 42200984 + ... + 42201023.

It is an arithmetic number, because the mean of its divisors is an integer number (295407028).

Almost surely, 2^1688040140 is an apocalyptic number.

1688040140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688040140 is an abundant number, since it is smaller than the sum of its proper divisors (1856844196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1688040140 is a wasteful number, since it uses less digits than its factorization.

1688040140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84402016 (or 84402014 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1688040140 is about 41085.7656616011. The cubic root of 1688040140 is about 1190.6778004337.

The spelling of 1688040140 in words is "one billion, six hundred eighty-eight million, forty thousand, one hundred forty".