1772720 has 20 divisors (see below), whose sum is σ = 4121760. Its totient is φ = 709056.

The previous prime is 1772713. The next prime is 1772723. The reversal of 1772720 is 272771.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1772720.

It is not an unprimeable number, because it can be changed into a prime (1772723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11000 + ... + 11159.

It is an arithmetic number, because the mean of its divisors is an integer number (206088).

2^1772720 is an apocalyptic number.

1772720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1772720 is an abundant number, since it is smaller than the sum of its proper divisors (2349040).

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

1772720 is a wasteful number, since it uses less digits than its factorization.

1772720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22172 (or 22166 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 1772720 is about 1331.4353157401. The cubic root of 1772720 is about 121.0263813342.

The spelling of 1772720 in words is "one million, seven hundred seventy-two thousand, seven hundred twenty".