1225290 has 64 divisors (see below), whose sum is σ = 3317760. Its totient is φ = 287040.

The previous prime is 1225283. The next prime is 1225297. The reversal of 1225290 is 925221.

It is an interprime number because it is at equal distance from previous prime (1225283) and next prime (1225297).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15471 + ... + 15549.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2^1225290 is an apocalyptic number.

1225290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1658880).

1225290 is an abundant number, since it is smaller than the sum of its proper divisors (2092470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225290 is a wasteful number, since it uses less digits than its factorization.

1225290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1225290 is about 1106.9281819522. The cubic root of 1225290 is about 107.0071908289.

The spelling of 1225290 in words is "one million, two hundred twenty-five thousand, two hundred ninety".