139557466 has 4 divisors (see below), whose sum is σ = 209336202. Its totient is φ = 69778732.

The previous prime is 139557463. The next prime is 139557487. The reversal of 139557466 is 664755931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 664755931 = 7 ⋅94965133.

It can be written as a sum of positive squares in only one way, i.e., 137381841 + 2175625 = 11721^2 + 1475^2 .

It is not an unprimeable number, because it can be changed into a prime (139557461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34889365 + ... + 34889368.

Almost surely, 2^139557466 is an apocalyptic number.

139557466 is a deficient number, since it is larger than the sum of its proper divisors (69778736).

139557466 is an equidigital number, since it uses as much as digits as its factorization.

139557466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69778735.

The product of its digits is 680400, while the sum is 46.

The square root of 139557466 is about 11813.4442902991. Note that the first 3 decimals coincide. The cubic root of 139557466 is about 518.7017243313.

The spelling of 139557466 in words is "one hundred thirty-nine million, five hundred fifty-seven thousand, four hundred sixty-six".