139221477 has 16 divisors (see below), whose sum is σ = 207574080. Its totient is φ = 92220336.

The previous prime is 139221469. The next prime is 139221503. The reversal of 139221477 is 774122931.

It is not a de Polignac number, because 139221477 - 2³ = 139221469 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139221437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12183 + ... + 20660.

It is an arithmetic number, because the mean of its divisors is an integer number (12973380).

Almost surely, 2^139221477 is an apocalyptic number.

It is an amenable number.

139221477 is a deficient number, since it is larger than the sum of its proper divisors (68352603).

139221477 is a wasteful number, since it uses less digits than its factorization.

139221477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33009 (or 33003 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 139221477 is about 11799.2151010141. The cubic root of 139221477 is about 518.2851262421.

The spelling of 139221477 in words is "one hundred thirty-nine million, two hundred twenty-one thousand, four hundred seventy-seven".