139522866 has 16 divisors (see below), whose sum is σ = 318909504. Its totient is φ = 39863664.

The previous prime is 139522861. The next prime is 139522883. The reversal of 139522866 is 668225931.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3321973 = 139522866 / (1 + 3 + 9 + 5 + 2 + 2 + 8 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (139522861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660945 + ... + 1661028.

It is an arithmetic number, because the mean of its divisors is an integer number (19931844).

Almost surely, 2^139522866 is an apocalyptic number.

139522866 is an abundant number, since it is smaller than the sum of its proper divisors (179386638).

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

139522866 is a wasteful number, since it uses less digits than its factorization.

139522866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321985.

The product of its digits is 155520, while the sum is 42.

The square root of 139522866 is about 11811.9797663220. The cubic root of 139522866 is about 518.6588541465.

The spelling of 139522866 in words is "one hundred thirty-nine million, five hundred twenty-two thousand, eight hundred sixty-six".