139429661 has 8 divisors (see below), whose sum is σ = 164488704. Its totient is φ = 115655760.

The previous prime is 139429621. The next prime is 139429663. The reversal of 139429661 is 166924931.

139429661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139429661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139429663) 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, 321050 + ... + 321483.

It is an arithmetic number, because the mean of its divisors is an integer number (20561088).

Almost surely, 2^139429661 is an apocalyptic number.

It is an amenable number.

139429661 is a deficient number, since it is larger than the sum of its proper divisors (25059043).

139429661 is an equidigital number, since it uses as much as digits as its factorization.

139429661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642571.

The product of its digits is 69984, while the sum is 41.

The square root of 139429661 is about 11808.0337482580. The cubic root of 139429661 is about 518.5433357650.

The spelling of 139429661 in words is "one hundred thirty-nine million, four hundred twenty-nine thousand, six hundred sixty-one".