2139437887 has 4 divisors (see below), whose sum is σ = 2143349656. Its totient is φ = 2135526120.

The previous prime is 2139437873. The next prime is 2139437891. The reversal of 2139437887 is 7887349312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2139437887 - 2²³ = 2131049279 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 (2139437827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955064 + ... + 1956157.

It is an arithmetic number, because the mean of its divisors is an integer number (535837414).

Almost surely, 2^2139437887 is an apocalyptic number.

2139437887 is a deficient number, since it is larger than the sum of its proper divisors (3911769).

2139437887 is an equidigital number, since it uses as much as digits as its factorization.

2139437887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911768.

The product of its digits is 2032128, while the sum is 52.

The square root of 2139437887 is about 46254.0580598070. The cubic root of 2139437887 is about 1288.5459021582.

The spelling of 2139437887 in words is "two billion, one hundred thirty-nine million, four hundred thirty-seven thousand, eight hundred eighty-seven".