139281405 has 8 divisors (see below), whose sum is σ = 222850272. Its totient is φ = 74283408.

The previous prime is 139281383. The next prime is 139281421. The reversal of 139281405 is 504182931.

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

It is not a de Polignac number, because 139281405 - 2¹³ = 139273213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4642699 + ... + 4642728.

It is an arithmetic number, because the mean of its divisors is an integer number (27856284).

Almost surely, 2^139281405 is an apocalyptic number.

139281405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139281405 is a deficient number, since it is larger than the sum of its proper divisors (83568867).

139281405 is an equidigital number, since it uses as much as digits as its factorization.

139281405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9285435.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 139281405 is about 11801.7543187443. The cubic root of 139281405 is about 518.3594809949.

The spelling of 139281405 in words is "one hundred thirty-nine million, two hundred eighty-one thousand, four hundred five".