139389666 has 32 divisors (see below), whose sum is σ = 301253568. Its totient is φ = 42742080.

The previous prime is 139389661. The next prime is 139389673. The reversal of 139389666 is 666983931.

139389666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (139389661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21036 + ... + 26856.

It is an arithmetic number, because the mean of its divisors is an integer number (9414174).

Almost surely, 2^139389666 is an apocalyptic number.

139389666 is an abundant number, since it is smaller than the sum of its proper divisors (161863902).

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

139389666 is a wasteful number, since it uses less digits than its factorization.

139389666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146.

The product of its digits is 1259712, while the sum is 51.

The square root of 139389666 is about 11806.3400764166. The cubic root of 139389666 is about 518.4937501320.

The spelling of 139389666 in words is "one hundred thirty-nine million, three hundred eighty-nine thousand, six hundred sixty-six".