1977849 has 6 divisors (see below), whose sum is σ = 2856906. Its totient is φ = 1318560.

The previous prime is 1977827. The next prime is 1977863. The reversal of 1977849 is 9487791.

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 837225 = 1068^2 + 915^2 .

It is not a de Polignac number, because 1977849 - 2⁵ = 1977817 is a prime.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1977809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109872 + ... + 109889.

It is an arithmetic number, because the mean of its divisors is an integer number (476151).

2^1977849 is an apocalyptic number.

It is an amenable number.

1977849 is a deficient number, since it is larger than the sum of its proper divisors (879057).

1977849 is a wasteful number, since it uses less digits than its factorization.

1977849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219767 (or 219764 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1977849 is about 1406.3601956825. The cubic root of 1977849 is about 125.5252352655.

The spelling of 1977849 in words is "one million, nine hundred seventy-seven thousand, eight hundred forty-nine".