1538398698 has 8 divisors (see below), whose sum is σ = 3076797408. Its totient is φ = 512799564.

The previous prime is 1538398661. The next prime is 1538398733. The reversal of 1538398698 is 8968938351.

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

1538398698 is an admirable 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 in 3 ways as a sum of consecutive naturals, for example, 128199886 + ... + 128199897.

It is an arithmetic number, because the mean of its divisors is an integer number (384599676).

Almost surely, 2^1538398698 is an apocalyptic number.

1538398698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1538398698 is a wasteful number, since it uses less digits than its factorization.

1538398698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256399788.

The product of its digits is 11197440, while the sum is 60.

The square root of 1538398698 is about 39222.4259576075. The cubic root of 1538398698 is about 1154.3999551807.

It can be divided in two parts, 153 and 8398698, that added together give a triangular number (8398851 = T₄₀₉₈).

The spelling of 1538398698 in words is "one billion, five hundred thirty-eight million, three hundred ninety-eight thousand, six hundred ninety-eight".