1977228 has 36 divisors (see below), whose sum is σ = 5453448. Its totient is φ = 599040.

The previous prime is 1977223. The next prime is 1977233. The reversal of 1977228 is 8227791.

It is an interprime number because it is at equal distance from previous prime (1977223) and next prime (1977233).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1977192 and 1977201.

It is not an unprimeable number, because it can be changed into a prime (1977223) 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 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 2892.

2^1977228 is an apocalyptic number.

1977228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1977228 is an abundant number, since it is smaller than the sum of its proper divisors (3476220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1977228 is a wasteful number, since it uses less digits than its factorization.

1977228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5014 (or 5009 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1977228 is about 1406.1393956504. The cubic root of 1977228 is about 125.5120965256.

The spelling of 1977228 in words is "one million, nine hundred seventy-seven thousand, two hundred twenty-eight".