1209434421 has 16 divisors (see below), whose sum is σ = 1737302336. Its totient is φ = 743976576.

The previous prime is 1209434411. The next prime is 1209434431. The reversal of 1209434421 is 1244349021.

It is an interprime number because it is at equal distance from previous prime (1209434411) and next prime (1209434431).

It is not a de Polignac number, because 1209434421 - 2⁵ = 1209434389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209434411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139026 + ... + 147468.

It is an arithmetic number, because the mean of its divisors is an integer number (108581396).

Almost surely, 2^1209434421 is an apocalyptic number.

It is an amenable number.

1209434421 is a deficient number, since it is larger than the sum of its proper divisors (527867915).

1209434421 is a wasteful number, since it uses less digits than its factorization.

1209434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12132.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1209434421 is about 34776.9236851105. The cubic root of 1209434421 is about 1065.4361827242.

The spelling of 1209434421 in words is "one billion, two hundred nine million, four hundred thirty-four thousand, four hundred twenty-one".