1688997454 has 8 divisors (see below), whose sum is σ = 2541591360. Its totient is φ = 841800336.

The previous prime is 1688997451. The next prime is 1688997467. The reversal of 1688997454 is 4547998861.

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

It is a junction number, because it is equal to n+sod(n) for n = 1688997392 and 1688997401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688997451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1348414 + ... + 1349665.

It is an arithmetic number, because the mean of its divisors is an integer number (317698920).

Almost surely, 2^1688997454 is an apocalyptic number.

1688997454 is a deficient number, since it is larger than the sum of its proper divisors (852593906).

1688997454 is a wasteful number, since it uses less digits than its factorization.

1688997454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698394.

The product of its digits is 17418240, while the sum is 61.

The square root of 1688997454 is about 41097.4142008959. The cubic root of 1688997454 is about 1190.9028419069.

The spelling of 1688997454 in words is "one billion, six hundred eighty-eight million, nine hundred ninety-seven thousand, four hundred fifty-four".