139401855 has 24 divisors (see below), whose sum is σ = 242041488. Its totient is φ = 74221056.

The previous prime is 139401833. The next prime is 139401863. The reversal of 139401855 is 558104931.

It is not a de Polignac number, because 139401855 - 2⁶ = 139401791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27984 + ... + 32586.

It is an arithmetic number, because the mean of its divisors is an integer number (10085062).

Almost surely, 2^139401855 is an apocalyptic number.

139401855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139401855 is a deficient number, since it is larger than the sum of its proper divisors (102639633).

139401855 is a wasteful number, since it uses less digits than its factorization.

139401855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287 (or 5284 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 139401855 is about 11806.8562708284. The cubic root of 139401855 is about 518.5088630077.

The spelling of 139401855 in words is "one hundred thirty-nine million, four hundred one thousand, eight hundred fifty-five".