1228690 has 8 divisors (see below), whose sum is σ = 2211660. Its totient is φ = 491472.

The previous prime is 1228679. The next prime is 1228691. The reversal of 1228690 is 968221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1203409 + 25281 = 1097^2 + 159^2 .

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

It is a super-2 number, since 2×1228690² = 3019358232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1228691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61425 + ... + 61444.

2^1228690 is an apocalyptic number.

1228690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1228690 is a deficient number, since it is larger than the sum of its proper divisors (982970).

1228690 is a wasteful number, since it uses less digits than its factorization.

1228690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122876.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1228690 is about 1108.4628996949. The cubic root of 1228690 is about 107.1060758403.

The spelling of 1228690 in words is "one million, two hundred twenty-eight thousand, six hundred ninety".