1247778 has 32 divisors (see below), whose sum is σ = 3169920. Its totient is φ = 356400.

The previous prime is 1247777. The next prime is 1247797. The reversal of 1247778 is 8777421.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1247777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1273 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (99060).

2^1247778 is an apocalyptic number.

1247778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1247778 is an abundant number, since it is smaller than the sum of its proper divisors (1922142).

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

1247778 is a wasteful number, since it uses less digits than its factorization.

1247778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319 (or 3313 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 1247778 is about 1117.0398381437. The cubic root of 1247778 is about 107.6578679251.

It can be divided in two parts, 1247 and 778, that added together give a square (2025 = 45²).

The spelling of 1247778 in words is "one million, two hundred forty-seven thousand, seven hundred seventy-eight".