2139947639 has 8 divisors (see below), whose sum is σ = 2241950208. Its totient is φ = 2040005880.

The previous prime is 2139947633. The next prime is 2139947687. The reversal of 2139947639 is 9367499312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2139947639 - 2¹² = 2139943543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139947633) 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, 513077 + ... + 517230.

It is an arithmetic number, because the mean of its divisors is an integer number (280243776).

Almost surely, 2^2139947639 is an apocalyptic number.

2139947639 is a deficient number, since it is larger than the sum of its proper divisors (102002569).

2139947639 is a wasteful number, since it uses less digits than its factorization.

2139947639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030405.

The product of its digits is 2204496, while the sum is 53.

The square root of 2139947639 is about 46259.5680805604. The cubic root of 2139947639 is about 1288.6482322600.

The spelling of 2139947639 in words is "two billion, one hundred thirty-nine million, nine hundred forty-seven thousand, six hundred thirty-nine".