1398868728 has 32 divisors (see below), whose sum is σ = 3509125200. Its totient is φ = 464695808.

The previous prime is 1398868727. The next prime is 1398868729. The reversal of 1398868728 is 8278688931.

It is an interprime number because it is at equal distance from previous prime (1398868727) and next prime (1398868729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398868727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92433 + ... + 106496.

Almost surely, 2^1398868728 is an apocalyptic number.

It is an amenable number.

1398868728 is an abundant number, since it is smaller than the sum of its proper divisors (2110256472).

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

1398868728 is a wasteful number, since it uses less digits than its factorization.

1398868728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199231 (or 199227 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 60.

The square root of 1398868728 is about 37401.4535546414. The cubic root of 1398868728 is about 1118.3875414852.

The spelling of 1398868728 in words is "one billion, three hundred ninety-eight million, eight hundred sixty-eight thousand, seven hundred twenty-eight".