1243890422 has 4 divisors (see below), whose sum is σ = 1865835636. Its totient is φ = 621945210.

The previous prime is 1243890413. The next prime is 1243890437. The reversal of 1243890422 is 2240983421.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×1243890422³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 310972604 + ... + 310972607.

It is an arithmetic number, because the mean of its divisors is an integer number (466458909).

Almost surely, 2^1243890422 is an apocalyptic number.

1243890422 is a deficient number, since it is larger than the sum of its proper divisors (621945214).

1243890422 is an equidigital number, since it uses as much as digits as its factorization.

1243890422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621945213.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1243890422 is about 35268.8307433065. The cubic root of 1243890422 is about 1075.4594529987.

The spelling of 1243890422 in words is "one billion, two hundred forty-three million, eight hundred ninety thousand, four hundred twenty-two".