139378855 has 32 divisors (see below), whose sum is σ = 209899008. Its totient is φ = 86313600.

The previous prime is 139378849. The next prime is 139378859. The reversal of 139378855 is 558873931.

It is not a de Polignac number, because 139378855 - 2³ = 139378847 is a prime.

It is a super-2 number, since 2×139378855² = 38852930442222050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139378799 and 139378808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139378859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61645 + ... + 63865.

It is an arithmetic number, because the mean of its divisors is an integer number (6559344).

Almost surely, 2^139378855 is an apocalyptic number.

139378855 is a deficient number, since it is larger than the sum of its proper divisors (70520153).

139378855 is a wasteful number, since it uses less digits than its factorization.

139378855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407.

The product of its digits is 907200, while the sum is 49.

The square root of 139378855 is about 11805.8822203171. The cubic root of 139378855 is about 518.4803450711.

The spelling of 139378855 in words is "one hundred thirty-nine million, three hundred seventy-eight thousand, eight hundred fifty-five".