139788257 has 8 divisors (see below), whose sum is σ = 164076096. Its totient is φ = 116579952.

The previous prime is 139788239. The next prime is 139788277. The reversal of 139788257 is 752887931.

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

It is a cyclic number.

It is not a de Polignac number, because 139788257 - 2⁶ = 139788193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139788277) 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, 269603 + ... + 270120.

It is an arithmetic number, because the mean of its divisors is an integer number (20509512).

Almost surely, 2^139788257 is an apocalyptic number.

It is an amenable number.

139788257 is a deficient number, since it is larger than the sum of its proper divisors (24287839).

139788257 is an equidigital number, since it uses as much as digits as its factorization.

139788257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539767.

The product of its digits is 846720, while the sum is 50.

The square root of 139788257 is about 11823.2084055048. The cubic root of 139788257 is about 518.9874985078.

The spelling of 139788257 in words is "one hundred thirty-nine million, seven hundred eighty-eight thousand, two hundred fifty-seven".