139736042 has 4 divisors (see below), whose sum is σ = 209604066. Its totient is φ = 69868020.

The previous prime is 139736021. The next prime is 139736057. The reversal of 139736042 is 240637931.

It is a Cunningham number, because it is equal to 11821²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240637931 = 59 ⋅4078609.

It can be written as a sum of positive squares in only one way, i.e., 139736041 + 1 = 11821^2 + 1^2 .

It is a super-2 number, since 2×139736042² = 39052322867651528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139735993 and 139736011.

It is an unprimeable number.

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, 34934009 + ... + 34934012.

Almost surely, 2^139736042 is an apocalyptic number.

139736042 is a deficient number, since it is larger than the sum of its proper divisors (69868024).

139736042 is an equidigital number, since it uses as much as digits as its factorization.

139736042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69868023.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 139736042 is about 11821.0000422976. Note that the first 4 decimals coincide. The cubic root of 139736042 is about 518.9228714602.

The spelling of 139736042 in words is "one hundred thirty-nine million, seven hundred thirty-six thousand, forty-two".