1213972 has 6 divisors (see below), whose sum is σ = 2124458. Its totient is φ = 606984.

The previous prime is 1213951. The next prime is 1213981. The reversal of 1213972 is 2793121.

It can be written as a sum of positive squares in only one way, i.e., 799236 + 414736 = 894^2 + 644^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 151743 + ... + 151750.

2^1213972 is an apocalyptic number.

It is an amenable number.

1213972 is a deficient number, since it is larger than the sum of its proper divisors (910486).

1213972 is a wasteful number, since it uses less digits than its factorization.

1213972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303497 (or 303495 counting only the distinct ones).

The product of its digits is 756, while the sum is 25.

The square root of 1213972 is about 1101.8039753060. The cubic root of 1213972 is about 106.6766961056.

The spelling of 1213972 in words is "one million, two hundred thirteen thousand, nine hundred seventy-two".