1977939 has 10 divisors (see below), whose sum is σ = 2954820. Its totient is φ = 1318572.

The previous prime is 1977929. The next prime is 1977953. The reversal of 1977939 is 9397791.

It is not a de Polignac number, because 1977939 - 2⁹ = 1977427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977894 and 1977903.

It is not an unprimeable number, because it can be changed into a prime (1977929) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12129 + ... + 12290.

It is an arithmetic number, because the mean of its divisors is an integer number (295482).

2^1977939 is an apocalyptic number.

1977939 is a deficient number, since it is larger than the sum of its proper divisors (976881).

1977939 is an equidigital number, since it uses as much as digits as its factorization.

1977939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24431 (or 24422 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 1977939 is about 1406.3921928111. The cubic root of 1977939 is about 125.5271392025.

It can be divided in two parts, 1977 and 939, that added together give a square (2916 = 54²).

The spelling of 1977939 in words is "one million, nine hundred seventy-seven thousand, nine hundred thirty-nine".