139221630 has 24 divisors (see below), whose sum is σ = 361976472. Its totient is φ = 37125744.

The previous prime is 139221629. The next prime is 139221631. The reversal of 139221630 is 36122931.

139221630 is a `hidden beast` number, since 1 + 3 + 9 + 2 + 21 + 630 = 666.

139221630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (139221629) and next prime (139221631).

It is a junction number, because it is equal to n+sod(n) for n = 139221594 and 139221603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139221631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 773364 + ... + 773543.

It is an arithmetic number, because the mean of its divisors is an integer number (15082353).

Almost surely, 2^139221630 is an apocalyptic number.

139221630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139221630 is an abundant number, since it is smaller than the sum of its proper divisors (222754842).

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

139221630 is a wasteful number, since it uses less digits than its factorization.

139221630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546920 (or 1546917 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 139221630 is about 11799.2215844945. The cubic root of 139221630 is about 518.2853161016.

The spelling of 139221630 in words is "one hundred thirty-nine million, two hundred twenty-one thousand, six hundred thirty".