1221970 has 16 divisors (see below), whose sum is σ = 2225880. Its totient is φ = 482944.

The previous prime is 1221959. The next prime is 1221971. The reversal of 1221970 is 791221.

It can be written as a sum of positive squares in 4 ways, for example, as 1121481 + 100489 = 1059^2 + 317^2 .

It is not an unprimeable number, because it can be changed into a prime (1221971) 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, 204 + ... + 1576.

2^1221970 is an apocalyptic number.

1221970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221970 is a deficient number, since it is larger than the sum of its proper divisors (1003910).

1221970 is a wasteful number, since it uses less digits than its factorization.

1221970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1221970 is about 1105.4275191074. The cubic root of 1221970 is about 106.9104558445.

The spelling of 1221970 in words is "one million, two hundred twenty-one thousand, nine hundred seventy".