139961378 has 8 divisors (see below), whose sum is σ = 210028368. Its totient is φ = 69951924.

The previous prime is 139961333. The next prime is 139961383. The reversal of 139961378 is 873169931.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7676 + ... + 18407.

It is an arithmetic number, because the mean of its divisors is an integer number (26253546).

Almost surely, 2^139961378 is an apocalyptic number.

139961378 is a deficient number, since it is larger than the sum of its proper divisors (70066990).

139961378 is a wasteful number, since it uses less digits than its factorization.

139961378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28768.

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

The square root of 139961378 is about 11830.5273762415. The cubic root of 139961378 is about 519.2016571014.

The spelling of 139961378 in words is "one hundred thirty-nine million, nine hundred sixty-one thousand, three hundred seventy-eight".