1219797 has 6 divisors (see below), whose sum is σ = 1761942. Its totient is φ = 813192.

The previous prime is 1219793. The next prime is 1219807. The reversal of 1219797 is 7979121.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 40401 = 1086^2 + 201^2 .

It is not a de Polignac number, because 1219797 - 2² = 1219793 is a prime.

1219797 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67758 + ... + 67775.

It is an arithmetic number, because the mean of its divisors is an integer number (293657).

2^1219797 is an apocalyptic number.

It is an amenable number.

1219797 is a deficient number, since it is larger than the sum of its proper divisors (542145).

1219797 is a wasteful number, since it uses less digits than its factorization.

1219797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135539 (or 135536 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1219797 is about 1104.4442041135. Note that the first 3 decimals coincide. The cubic root of 1219797 is about 106.8470461415.

It can be divided in two parts, 1219 and 797, that added together give a triangular number (2016 = T₆₃).

The spelling of 1219797 in words is "one million, two hundred nineteen thousand, seven hundred ninety-seven".