1977147 has 6 divisors (see below), whose sum is σ = 2855892. Its totient is φ = 1318092.

The previous prime is 1977139. The next prime is 1977163. The reversal of 1977147 is 7417791.

It is not a de Polignac number, because 1977147 - 2³ = 1977139 is a prime.

It is a super-2 number, since 2×1977147² = 7818220519218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1977187) 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 5 ways as a sum of consecutive naturals, for example, 109833 + ... + 109850.

It is an arithmetic number, because the mean of its divisors is an integer number (475982).

2^1977147 is an apocalyptic number.

1977147 is a deficient number, since it is larger than the sum of its proper divisors (878745).

1977147 is a wasteful number, since it uses less digits than its factorization.

1977147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219689 (or 219686 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 1977147 is about 1406.1105930900. The cubic root of 1977147 is about 125.5103825741.

The spelling of 1977147 in words is "one million, nine hundred seventy-seven thousand, one hundred forty-seven".