139819905 has 32 divisors (see below), whose sum is σ = 249532800. Its totient is φ = 74281536.

The previous prime is 139819903. The next prime is 139819909. The reversal of 139819905 is 509918931.

It is not a de Polignac number, because 139819905 - 2¹ = 139819903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (139819903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35526 + ... + 39264.

It is an arithmetic number, because the mean of its divisors is an integer number (7797900).

Almost surely, 2^139819905 is an apocalyptic number.

139819905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139819905 is a deficient number, since it is larger than the sum of its proper divisors (109712895).

139819905 is a wasteful number, since it uses less digits than its factorization.

139819905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030 (or 4024 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 139819905 is about 11824.5467143565. The cubic root of 139819905 is about 519.0266617330.

The spelling of 139819905 in words is "one hundred thirty-nine million, eight hundred nineteen thousand, nine hundred five".