1977656 has 16 divisors (see below), whose sum is σ = 3795000. Its totient is φ = 965664.

The previous prime is 1977637. The next prime is 1977667. The reversal of 1977656 is 6567791.

1977656 is nontrivially palindromic in base 7.

It is a super-2 number, since 2×1977656² = 7822246508672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2531 + ... + 3218.

2^1977656 is an apocalyptic number.

It is an amenable number.

1977656 is a deficient number, since it is larger than the sum of its proper divisors (1817344).

1977656 is a wasteful number, since it uses less digits than its factorization.

1977656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5798 (or 5794 counting only the distinct ones).

The product of its digits is 79380, while the sum is 41.

The square root of 1977656 is about 1406.2915771631. The cubic root of 1977656 is about 125.5211521836.

The spelling of 1977656 in words is "one million, nine hundred seventy-seven thousand, six hundred fifty-six".