1698489840 has 40 divisors (see below), whose sum is σ = 5265319248. Its totient is φ = 452930560.

The previous prime is 1698489823. The next prime is 1698489841. The reversal of 1698489840 is 489848961.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1698489841) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3538281 + ... + 3538760.

Almost surely, 2^1698489840 is an apocalyptic number.

1698489840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1698489840 is an abundant number, since it is smaller than the sum of its proper divisors (3566829408).

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

1698489840 is a wasteful number, since it uses less digits than its factorization.

1698489840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077057 (or 7077051 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The square root of 1698489840 is about 41212.7388073154. The cubic root of 1698489840 is about 1193.1296851559.

The spelling of 1698489840 in words is "one billion, six hundred ninety-eight million, four hundred eighty-nine thousand, eight hundred forty".