139309478 has 24 divisors (see below), whose sum is σ = 262503696. Its totient is φ = 54275760.

The previous prime is 139309439. The next prime is 139309481. The reversal of 139309478 is 874903931.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 39425 + ... + 42812.

It is an arithmetic number, because the mean of its divisors is an integer number (10937654).

Almost surely, 2^139309478 is an apocalyptic number.

139309478 is a deficient number, since it is larger than the sum of its proper divisors (123194218).

139309478 is a wasteful number, since it uses less digits than its factorization.

139309478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82268 (or 82257 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 139309478 is about 11802.9436158951. The cubic root of 139309478 is about 518.3943048063.

The spelling of 139309478 in words is "one hundred thirty-nine million, three hundred nine thousand, four hundred seventy-eight".