139243946 has 4 divisors (see below), whose sum is σ = 208865922. Its totient is φ = 69621972.

The previous prime is 139243931. The next prime is 139243963. The reversal of 139243946 is 649342931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 9853321 = 11375^2 + 3139^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34810985 + ... + 34810988.

Almost surely, 2^139243946 is an apocalyptic number.

139243946 is a deficient number, since it is larger than the sum of its proper divisors (69621976).

139243946 is an equidigital number, since it uses as much as digits as its factorization.

139243946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69621975.

The product of its digits is 139968, while the sum is 41.

The square root of 139243946 is about 11800.1672022052. The cubic root of 139243946 is about 518.3130068113.

The spelling of 139243946 in words is "one hundred thirty-nine million, two hundred forty-three thousand, nine hundred forty-six".