698943840 has 144 divisors (see below), whose sum is σ = 2561216112. Its totient is φ = 159753216.

The previous prime is 698943827. The next prime is 698943853. The reversal of 698943840 is 48349896.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (698943827) and next prime (698943853).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8662 + ... + 38378.

It is an arithmetic number, because the mean of its divisors is an integer number (17786223).

Almost surely, 2^698943840 is an apocalyptic number.

698943840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698943840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280608056).

698943840 is an abundant number, since it is smaller than the sum of its proper divisors (1862272272).

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

698943840 is a wasteful number, since it uses less digits than its factorization.

698943840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29749 (or 29734 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 698943840 is about 26437.5460283287. The cubic root of 698943840 is about 887.4572204467.

The spelling of 698943840 in words is "six hundred ninety-eight million, nine hundred forty-three thousand, eight hundred forty".