139144278 has 64 divisors (see below), whose sum is σ = 347300352. Its totient is φ = 36184320.

The previous prime is 139144261. The next prime is 139144279. The reversal of 139144278 is 872441931.

It is a super-2 number, since 2×139144278² = 38722260200282568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139144279) 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, 38113 + ... + 41603.

It is an arithmetic number, because the mean of its divisors is an integer number (5426568).

Almost surely, 2^139144278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139144278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173650176).

139144278 is an abundant number, since it is smaller than the sum of its proper divisors (208156074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139144278 is a wasteful number, since it uses less digits than its factorization.

139144278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589.

The product of its digits is 48384, while the sum is 39.

The square root of 139144278 is about 11795.9432857233. The cubic root of 139144278 is about 518.1893113049.

The spelling of 139144278 in words is "one hundred thirty-nine million, one hundred forty-four thousand, two hundred seventy-eight".