1777216 has 28 divisors (see below), whose sum is σ = 4031488. Its totient is φ = 761472.

The previous prime is 1777213. The next prime is 1777219. The reversal of 1777216 is 6127771.

It is an interprime number because it is at equal distance from previous prime (1777213) and next prime (1777219).

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (1777213) 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, 1536 + ... + 2431.

2^1777216 is an apocalyptic number.

1777216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1777216 is an abundant number, since it is smaller than the sum of its proper divisors (2254272).

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

1777216 is an equidigital number, since it uses as much as digits as its factorization.

1777216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986 (or 3976 counting only the distinct ones).

The product of its digits is 4116, while the sum is 31.

The square root of 1777216 is about 1333.1226500214. The cubic root of 1777216 is about 121.1286112866.

The spelling of 1777216 in words is "one million, seven hundred seventy-seven thousand, two hundred sixteen".