1229290 has 8 divisors (see below), whose sum is σ = 2212740. Its totient is φ = 491712.

The previous prime is 1229279. The next prime is 1229297. The reversal of 1229290 is 929221.

It can be written as a sum of positive squares in 2 ways, for example, as 1079521 + 149769 = 1039^2 + 387^2 .

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

It is a super-2 number, since 2×1229290² = 3022307808200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1229297) 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, 61455 + ... + 61474.

2^1229290 is an apocalyptic number.

1229290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1229290 is a deficient number, since it is larger than the sum of its proper divisors (983450).

1229290 is a wasteful number, since it uses less digits than its factorization.

1229290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122936.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1229290 is about 1108.7335117151. The cubic root of 1229290 is about 107.1235071934.

The spelling of 1229290 in words is "one million, two hundred twenty-nine thousand, two hundred ninety".