139405845 has 8 divisors (see below), whose sum is σ = 223049376. Its totient is φ = 74349776.

The previous prime is 139405841. The next prime is 139405859. The reversal of 139405845 is 548504931.

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 139405845 - 2² = 139405841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139405841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4646847 + ... + 4646876.

It is an arithmetic number, because the mean of its divisors is an integer number (27881172).

Almost surely, 2^139405845 is an apocalyptic number.

139405845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139405845 is a deficient number, since it is larger than the sum of its proper divisors (83643531).

139405845 is an equidigital number, since it uses as much as digits as its factorization.

139405845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293731.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 139405845 is about 11807.0252392379. The cubic root of 139405845 is about 518.5138099305.

The spelling of 139405845 in words is "one hundred thirty-nine million, four hundred five thousand, eight hundred forty-five".