139440506 has 8 divisors (see below), whose sum is σ = 220169280. Its totient is φ = 66050748.

The previous prime is 139440479. The next prime is 139440527. The reversal of 139440506 is 605044931.

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

It is a Curzon 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, 1834706 + ... + 1834781.

It is an arithmetic number, because the mean of its divisors is an integer number (27521160).

Almost surely, 2^139440506 is an apocalyptic number.

139440506 is a deficient number, since it is larger than the sum of its proper divisors (80728774).

139440506 is a wasteful number, since it uses less digits than its factorization.

139440506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669508.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 139440506 is about 11808.4929605771. The cubic root of 139440506 is about 518.5567797162.

The spelling of 139440506 in words is "one hundred thirty-nine million, four hundred forty thousand, five hundred six".