2139777 has 10 divisors (see below), whose sum is σ = 3196578. Its totient is φ = 1426464.

The previous prime is 2139757. The next prime is 2139811. The reversal of 2139777 is 7779312.

It can be written as a sum of positive squares in only one way, i.e., 1498176 + 641601 = 1224^2 + 801^2 .

It is not a de Polignac number, because 2139777 - 2⁸ = 2139521 is a prime.

2139777 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2139737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13128 + ... + 13289.

2^2139777 is an apocalyptic number.

2139777 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2139777 is a deficient number, since it is larger than the sum of its proper divisors (1056801).

2139777 is an equidigital number, since it uses as much as digits as its factorization.

2139777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26429 (or 26420 counting only the distinct ones).

The product of its digits is 18522, while the sum is 36.

The square root of 2139777 is about 1462.7976620162. The cubic root of 2139777 is about 128.8613979165.

It can be divided in two parts, 2139 and 777, that added together give a square (2916 = 54²).

The spelling of 2139777 in words is "two million, one hundred thirty-nine thousand, seven hundred seventy-seven".