139402905 has 16 divisors (see below), whose sum is σ = 234784320. Its totient is φ = 70435008.

The previous prime is 139402897. The next prime is 139402919. The reversal of 139402905 is 509204931.

139402905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139402905 - 2³ = 139402897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244282 + ... + 244851.

It is an arithmetic number, because the mean of its divisors is an integer number (14674020).

Almost surely, 2^139402905 is an apocalyptic number.

139402905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139402905 is a deficient number, since it is larger than the sum of its proper divisors (95381415).

139402905 is a wasteful number, since it uses less digits than its factorization.

139402905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489160.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 139402905 is about 11806.9007364338. The cubic root of 139402905 is about 518.5101648386.

The spelling of 139402905 in words is "one hundred thirty-nine million, four hundred two thousand, nine hundred five".