139212705 has 8 divisors (see below), whose sum is σ = 222740352. Its totient is φ = 74246768.

The previous prime is 139212659. The next prime is 139212757. The reversal of 139212705 is 507212931.

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

It is a cyclic number.

It is not a de Polignac number, because 139212705 - 2⁶ = 139212641 is a prime.

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, 4640409 + ... + 4640438.

It is an arithmetic number, because the mean of its divisors is an integer number (27842544).

Almost surely, 2^139212705 is an apocalyptic number.

139212705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139212705 is a deficient number, since it is larger than the sum of its proper divisors (83527647).

139212705 is an equidigital number, since it uses as much as digits as its factorization.

139212705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280855.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 139212705 is about 11798.8433755178. The cubic root of 139212705 is about 518.2742407266.

The spelling of 139212705 in words is "one hundred thirty-nine million, two hundred twelve thousand, seven hundred five".