1211405430 has 32 divisors (see below), whose sum is σ = 2910184704. Its totient is φ = 322729056.

The previous prime is 1211405389. The next prime is 1211405441. The reversal of 1211405430 is 345041121.

It is a super-3 number, since 3×1211405430³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211405397 and 1211405406.

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 in 15 ways as a sum of consecutive naturals, for example, 12897 + ... + 50883.

It is an arithmetic number, because the mean of its divisors is an integer number (90943272).

Almost surely, 2^1211405430 is an apocalyptic number.

1211405430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211405430 is an abundant number, since it is smaller than the sum of its proper divisors (1698779274).

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

1211405430 is a wasteful number, since it uses less digits than its factorization.

1211405430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39060.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1211405430 is about 34805.2500350163. The cubic root of 1211405430 is about 1066.0146472038.

Adding to 1211405430 its reverse (345041121), we get a palindrome (1556446551).

The spelling of 1211405430 in words is "one billion, two hundred eleven million, four hundred five thousand, four hundred thirty".