1698340678 has 4 divisors (see below), whose sum is σ = 2547511020. Its totient is φ = 849170338.

The previous prime is 1698340627. The next prime is 1698340687. The reversal of 1698340678 is 8760438961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8760438961 = 1031 ⋅8497031.

It is a super-2 number, since 2×1698340678² = 5768722117098999368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424585168 + ... + 424585171.

It is an arithmetic number, because the mean of its divisors is an integer number (636877755).

Almost surely, 2^1698340678 is an apocalyptic number.

1698340678 is a deficient number, since it is larger than the sum of its proper divisors (849170342).

1698340678 is an equidigital number, since it uses as much as digits as its factorization.

1698340678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849170341.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 1698340678 is about 41210.9291086721. The cubic root of 1698340678 is about 1193.0947571047.

The spelling of 1698340678 in words is "one billion, six hundred ninety-eight million, three hundred forty thousand, six hundred seventy-eight".