139950905 has 8 divisors (see below), whose sum is σ = 168006984. Its totient is φ = 111916800.

The previous prime is 139950901. The next prime is 139950907. The reversal of 139950905 is 509059931.

It can be written as a sum of positive squares in 4 ways, for example, as 5669161 + 134281744 = 2381^2 + 11588^2 .

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

It is not a de Polignac number, because 139950905 - 2² = 139950901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139950901) 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, 16625 + ... + 23585.

It is an arithmetic number, because the mean of its divisors is an integer number (21000873).

Almost surely, 2^139950905 is an apocalyptic number.

It is an amenable number.

139950905 is a deficient number, since it is larger than the sum of its proper divisors (28056079).

139950905 is an equidigital number, since it uses as much as digits as its factorization.

139950905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10987.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 139950905 is about 11830.0847418774. The cubic root of 139950905 is about 519.1887065416.

The spelling of 139950905 in words is "one hundred thirty-nine million, nine hundred fifty thousand, nine hundred five".