1243434621 has 32 divisors (see below), whose sum is σ = 2062343808. Its totient is φ = 654704640.

The previous prime is 1243434589. The next prime is 1243434631. The reversal of 1243434621 is 1264343421.

It is not a de Polignac number, because 1243434621 - 2⁵ = 1243434589 is a prime.

It is a super-2 number, since 2×1243434621² = 3092259313402827282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243434631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77956 + ... + 92541.

It is an arithmetic number, because the mean of its divisors is an integer number (64448244).

Almost surely, 2^1243434621 is an apocalyptic number.

1243434621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243434621 is a deficient number, since it is larger than the sum of its proper divisors (818909187).

1243434621 is a wasteful number, since it uses less digits than its factorization.

1243434621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170541.

The product of its digits is 13824, while the sum is 30.

The square root of 1243434621 is about 35262.3683407680. The cubic root of 1243434621 is about 1075.3280761046.

The spelling of 1243434621 in words is "one billion, two hundred forty-three million, four hundred thirty-four thousand, six hundred twenty-one".