1220740 has 24 divisors (see below), whose sum is σ = 2604672. Its totient is φ = 480480.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220740 is 470221.

It is a super-2 number, since 2×1220740² = 2980412295200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885 + ... + 1795.

It is an arithmetic number, because the mean of its divisors is an integer number (108528).

2^1220740 is an apocalyptic number.

1220740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220740 is an abundant number, since it is smaller than the sum of its proper divisors (1383932).

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

1220740 is a wasteful number, since it uses less digits than its factorization.

1220740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 1220740 is about 1104.8710331980. The cubic root of 1220740 is about 106.8745728013.

Adding to 1220740 its reverse (470221), we get a palindrome (1690961).

The spelling of 1220740 in words is "one million, two hundred twenty thousand, seven hundred forty".