1220749 has 8 divisors (see below), whose sum is σ = 1285632. Its totient is φ = 1157520.

The previous prime is 1220743. The next prime is 1220761. The reversal of 1220749 is 9470221.

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

It is not a de Polignac number, because 1220749 - 2⁵ = 1220717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220743) 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, 1272 + ... + 2014.

It is an arithmetic number, because the mean of its divisors is an integer number (160704).

2^1220749 is an apocalyptic number.

It is an amenable number.

1220749 is a deficient number, since it is larger than the sum of its proper divisors (64883).

1220749 is an equidigital number, since it uses as much as digits as its factorization.

1220749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1220749 is about 1104.8751060640. The cubic root of 1220749 is about 106.8748354477.

The spelling of 1220749 in words is "one million, two hundred twenty thousand, seven hundred forty-nine".