1688405372 has 6 divisors (see below), whose sum is σ = 2954709408. Its totient is φ = 844202684.

The previous prime is 1688405357. The next prime is 1688405401. The reversal of 1688405372 is 2735048861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211050668 + ... + 211050675.

It is an arithmetic number, because the mean of its divisors is an integer number (492451568).

Almost surely, 2^1688405372 is an apocalyptic number.

It is an amenable number.

1688405372 is a deficient number, since it is larger than the sum of its proper divisors (1266304036).

1688405372 is a wasteful number, since it uses less digits than its factorization.

1688405372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422101347 (or 422101345 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 1688405372 is about 41090.2101722539. The cubic root of 1688405372 is about 1190.7636677193.

The spelling of 1688405372 in words is "one billion, six hundred eighty-eight million, four hundred five thousand, three hundred seventy-two".