1220731 has 8 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 1131048.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220731 is 1370221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220731 - 2¹ = 1220729 is a prime.

It is a super-2 number, since 2×1220731² = 2980368348722, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1220711) 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, 210 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

2^1220731 is an apocalyptic number.

1220731 is a deficient number, since it is larger than the sum of its proper divisors (92549).

1220731 is a wasteful number, since it uses less digits than its factorization.

1220731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1220731 is about 1104.8669603169. The cubic root of 1220731 is about 106.8743101537.

Adding to 1220731 its reverse (1370221), we get a palindrome (2590952).

The spelling of 1220731 in words is "one million, two hundred twenty thousand, seven hundred thirty-one".