1977644 has 24 divisors (see below), whose sum is σ = 3709440. Its totient is φ = 919296.

The previous prime is 1977637. The next prime is 1977667. The reversal of 1977644 is 4467791.

It is a super-2 number, since 2×1977644² = 7822151581472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1977598 and 1977607.

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 7 ways as a sum of consecutive naturals, for example, 8522 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (154560).

2^1977644 is an apocalyptic number.

It is an amenable number.

1977644 is a deficient number, since it is larger than the sum of its proper divisors (1731796).

1977644 is a wasteful number, since it uses less digits than its factorization.

1977644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 375 counting only the distinct ones).

The product of its digits is 42336, while the sum is 38.

The square root of 1977644 is about 1406.2873106161. The cubic root of 1977644 is about 125.5208983044.

The spelling of 1977644 in words is "one million, nine hundred seventy-seven thousand, six hundred forty-four".