139891328 has 16 divisors (see below), whose sum is σ = 278690010. Its totient is φ = 69945600.

The previous prime is 139891321. The next prime is 139891333. The reversal of 139891328 is 823198931.

It can be written as a sum of positive squares in only one way, i.e., 136235584 + 3655744 = 11672^2 + 1912^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (139891321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 546323 + ... + 546578.

Almost surely, 2^139891328 is an apocalyptic number.

It is an amenable number.

139891328 is a deficient number, since it is larger than the sum of its proper divisors (138798682).

139891328 is an equidigital number, since it uses as much as digits as its factorization.

139891328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092915 (or 1092903 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 139891328 is about 11827.5664445396. The cubic root of 139891328 is about 519.1150233315.

The spelling of 139891328 in words is "one hundred thirty-nine million, eight hundred ninety-one thousand, three hundred twenty-eight".