139223628 has 18 divisors (see below), whose sum is σ = 351926484. Its totient is φ = 46407864.

The previous prime is 139223627. The next prime is 139223639. The reversal of 139223628 is 826322931.

139223628 is a `hidden beast` number, since 1 + 3 + 9 + 2 + 23 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3867323 = 139223628 / (1 + 3 + 9 + 2 + 2 + 3 + 6 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 139223592 and 139223601.

It is not an unprimeable number, because it can be changed into a prime (139223627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1933626 + ... + 1933697.

Almost surely, 2^139223628 is an apocalyptic number.

139223628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139223628 is an abundant number, since it is smaller than the sum of its proper divisors (212702856).

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

139223628 is a wasteful number, since it uses less digits than its factorization.

139223628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867333 (or 3867328 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 139223628 is about 11799.3062507929. The cubic root of 139223628 is about 518.2877954317.

The spelling of 139223628 in words is "one hundred thirty-nine million, two hundred twenty-three thousand, six hundred twenty-eight".