139197638 has 8 divisors (see below), whose sum is σ = 212335560. Its totient is φ = 68419120.

The previous prime is 139197577. The next prime is 139197647. The reversal of 139197638 is 836791931.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 139197592 and 139197601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589703 + ... + 589938.

It is an arithmetic number, because the mean of its divisors is an integer number (26541945).

Almost surely, 2^139197638 is an apocalyptic number.

139197638 is a deficient number, since it is larger than the sum of its proper divisors (73137922).

139197638 is a wasteful number, since it uses less digits than its factorization.

139197638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179702.

The product of its digits is 244944, while the sum is 47.

The square root of 139197638 is about 11798.2048634527. The cubic root of 139197638 is about 518.2555424339.

The spelling of 139197638 in words is "one hundred thirty-nine million, one hundred ninety-seven thousand, six hundred thirty-eight".