2139877 has 2 divisors, whose sum is σ = 2139878. Its totient is φ = 2139876.

The previous prime is 2139859. The next prime is 2139911. The reversal of 2139877 is 7789312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 83521 = 1434^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139877 - 2¹¹ = 2137829 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069938 + 1069939.

It is an arithmetic number, because the mean of its divisors is an integer number (1069939).

2^2139877 is an apocalyptic number.

It is an amenable number.

2139877 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139877 is an equidigital number, since it uses as much as digits as its factorization.

2139877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 2139877 is about 1462.8318426942. The cubic root of 2139877 is about 128.8634052813.

The spelling of 2139877 in words is "two million, one hundred thirty-nine thousand, eight hundred seventy-seven".