1977728 has 16 divisors (see below), whose sum is σ = 3940260. Its totient is φ = 988800.

The previous prime is 1977727. The next prime is 1977737. The reversal of 1977728 is 8277791.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×1977728² = 7822816083968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7598 + ... + 7853.

2^1977728 is an apocalyptic number.

It is an amenable number.

1977728 is a deficient number, since it is larger than the sum of its proper divisors (1962532).

1977728 is an equidigital number, since it uses as much as digits as its factorization.

1977728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15465 (or 15453 counting only the distinct ones).

The product of its digits is 49392, while the sum is 41.

The square root of 1977728 is about 1406.3171761733. The cubic root of 1977728 is about 125.5226754369.

The spelling of 1977728 in words is "one million, nine hundred seventy-seven thousand, seven hundred twenty-eight".