1212945 has 8 divisors (see below), whose sum is σ = 1940736. Its totient is φ = 646896.

The previous prime is 1212943. The next prime is 1212973. The reversal of 1212945 is 5492121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212945 - 2¹ = 1212943 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1212943) 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, 40417 + ... + 40446.

It is an arithmetic number, because the mean of its divisors is an integer number (242592).

2^1212945 is an apocalyptic number.

1212945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212945 is a deficient number, since it is larger than the sum of its proper divisors (727791).

1212945 is an equidigital number, since it uses as much as digits as its factorization.

1212945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80871.

The product of its digits is 720, while the sum is 24.

The square root of 1212945 is about 1101.3378228319. The cubic root of 1212945 is about 106.6466053852.

The spelling of 1212945 in words is "one million, two hundred twelve thousand, nine hundred forty-five".