1977881 has 8 divisors (see below), whose sum is σ = 2133600. Its totient is φ = 1827360.

The previous prime is 1977863. The next prime is 1977917. The reversal of 1977881 is 1887791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1977881 - 2⁶ = 1977817 is a prime.

It is a super-2 number, since 2×1977881² = 7824026500322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (266700).

2^1977881 is an apocalyptic number.

It is an amenable number.

1977881 is a deficient number, since it is larger than the sum of its proper divisors (155719).

1977881 is a wasteful number, since it uses less digits than its factorization.

1977881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599.

The product of its digits is 28224, while the sum is 41.

The square root of 1977881 is about 1406.3715725227. The cubic root of 1977881 is about 125.5259122275.

The spelling of 1977881 in words is "one million, nine hundred seventy-seven thousand, eight hundred eighty-one".