1977143 has 12 divisors (see below), whose sum is σ = 2342928. Its totient is φ = 1633440.

The previous prime is 1977139. The next prime is 1977163. The reversal of 1977143 is 3417791.

It is not a de Polignac number, because 1977143 - 2² = 1977139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23780 + ... + 23862.

It is an arithmetic number, because the mean of its divisors is an integer number (195244).

2^1977143 is an apocalyptic number.

1977143 is a deficient number, since it is larger than the sum of its proper divisors (365785).

1977143 is an frugal number, since it uses more digits than its factorization.

1977143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 131 counting only the distinct ones).

The product of its digits is 5292, while the sum is 32.

The square root of 1977143 is about 1406.1091707261. The cubic root of 1977143 is about 125.5102979333.

The spelling of 1977143 in words is "one million, nine hundred seventy-seven thousand, one hundred forty-three".