1688458494 has 8 divisors (see below), whose sum is σ = 3376917000. Its totient is φ = 562819496.

The previous prime is 1688458487. The next prime is 1688458507. The reversal of 1688458494 is 4948548861.

It is a happy number.

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

1688458494 is an admirable number.

It is a congruent number.

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, 140704869 + ... + 140704880.

It is an arithmetic number, because the mean of its divisors is an integer number (422114625).

Almost surely, 2^1688458494 is an apocalyptic number.

1688458494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1688458494 is a wasteful number, since it uses less digits than its factorization.

1688458494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281409754.

The product of its digits is 8847360, while the sum is 57.

The square root of 1688458494 is about 41090.8565741820. The cubic root of 1688458494 is about 1190.7761558507.

The spelling of 1688458494 in words is "one billion, six hundred eighty-eight million, four hundred fifty-eight thousand, four hundred ninety-four".