139011228 has 60 divisors (see below), whose sum is σ = 364562352. Its totient is φ = 46189440.

The previous prime is 139011203. The next prime is 139011233. The reversal of 139011228 is 822110931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 157348 + ... + 158228.

Almost surely, 2^139011228 is an apocalyptic number.

139011228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139011228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182281176).

139011228 is an abundant number, since it is smaller than the sum of its proper divisors (225551124).

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

139011228 is a wasteful number, since it uses less digits than its factorization.

139011228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 139011228 is about 11790.3022862011. The cubic root of 139011228 is about 518.0240941273.

It can be divided in two parts, 13901 and 1228, that added together give a square (15129 = 123²).

The spelling of 139011228 in words is "one hundred thirty-nine million, eleven thousand, two hundred twenty-eight".