1217972 has 12 divisors (see below), whose sum is σ = 2436000. Its totient is φ = 521976.

The previous prime is 1217963. The next prime is 1217977. The reversal of 1217972 is 2797121.

1217972 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217977) 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, 21722 + ... + 21777.

It is an arithmetic number, because the mean of its divisors is an integer number (203000).

2^1217972 is an apocalyptic number.

It is an amenable number.

1217972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1217972 is a wasteful number, since it uses less digits than its factorization.

1217972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43510 (or 43508 counting only the distinct ones).

The product of its digits is 1764, while the sum is 29.

The square root of 1217972 is about 1103.6176874262. The cubic root of 1217972 is about 106.7937331208.

The spelling of 1217972 in words is "one million, two hundred seventeen thousand, nine hundred seventy-two".