1217420 has 24 divisors (see below), whose sum is σ = 2646000. Its totient is φ = 469952.

The previous prime is 1217417. The next prime is 1217423. The reversal of 1217420 is 247121.

It is an interprime number because it is at equal distance from previous prime (1217417) and next prime (1217423).

It is a super-2 number, since 2×1217420² = 2964222912800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1217423) 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, 470 + ... + 1629.

It is an arithmetic number, because the mean of its divisors is an integer number (110250).

2^1217420 is an apocalyptic number.

1217420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217420 is an abundant number, since it is smaller than the sum of its proper divisors (1428580).

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

1217420 is a wasteful number, since it uses less digits than its factorization.

1217420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2135 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1217420 is about 1103.3675724798. The cubic root of 1217420 is about 106.7775972686. Note that the first 3 decimals are identical.

Subtracting from 1217420 its reverse (247121), we obtain a cube (970299 = 99³).

The spelling of 1217420 in words is "one million, two hundred seventeen thousand, four hundred twenty".