139317768 has 24 divisors (see below), whose sum is σ = 377319150. Its totient is φ = 46439232.

The previous prime is 139317767. The next prime is 139317781. The reversal of 139317768 is 867713931.

It can be written as a sum of positive squares in only one way, i.e., 130919364 + 8398404 = 11442^2 + 2898^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (139317767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 967413 + ... + 967556.

Almost surely, 2^139317768 is an apocalyptic number.

139317768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139317768 is an abundant number, since it is smaller than the sum of its proper divisors (238001382).

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

139317768 is a wasteful number, since it uses less digits than its factorization.

139317768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934981 (or 1934974 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 139317768 is about 11803.2947942513. The cubic root of 139317768 is about 518.4045874365.

The spelling of 139317768 in words is "one hundred thirty-nine million, three hundred seventeen thousand, seven hundred sixty-eight".