1235020290 has 64 divisors (see below), whose sum is σ = 3399701760. Its totient is φ = 281272320.

The previous prime is 1235020231. The next prime is 1235020307. The reversal of 1235020290 is 920205321.

It is a self number, because there is not a number n which added to its sum of digits gives 1235020290.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48546 + ... + 69474.

It is an arithmetic number, because the mean of its divisors is an integer number (53120340).

Almost surely, 2^1235020290 is an apocalyptic number.

1235020290 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 1235020290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699850880).

1235020290 is an abundant number, since it is smaller than the sum of its proper divisors (2164681470).

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

1235020290 is a wasteful number, since it uses less digits than its factorization.

1235020290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1235020290 is about 35142.8554616724. The cubic root of 1235020290 is about 1072.8969998586.

It can be divided in two parts, 12350 and 20290, that added together give a triangular number (32640 = T₂₅₅).

The spelling of 1235020290 in words is "one billion, two hundred thirty-five million, twenty thousand, two hundred ninety".