139478 has 4 divisors (see below), whose sum is σ = 209220. Its totient is φ = 69738.

The previous prime is 139459. The next prime is 139483. The reversal of 139478 is 874931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874931 = 19 ⋅46049.

It is a super-2 number, since 2×139478² = 38908224968, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

139478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34868 + ... + 34871.

It is an arithmetic number, because the mean of its divisors is an integer number (52305).

2¹³⁹⁴⁷⁸ is an apocalyptic number.

139478 is a deficient number, since it is larger than the sum of its proper divisors (69742).

139478 is an equidigital number, since it uses as much as digits as its factorization.

139478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69741.

The product of its digits is 6048, while the sum is 32.

The square root of 139478 is about 373.4675354030. The cubic root of 139478 is about 51.8603253600.

The spelling of 139478 in words is "one hundred thirty-nine thousand, four hundred seventy-eight".