1212440431 has 4 divisors (see below), whose sum is σ = 1217644272. Its totient is φ = 1207236592.

The previous prime is 1212440417. The next prime is 1212440441. The reversal of 1212440431 is 1340442121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1340442121 = 61 ⋅21974461.

It is a cyclic number.

It is not a de Polignac number, because 1212440431 - 2⁵ = 1212440399 is a prime.

It is a super-2 number, since 2×1212440431² = 2940023597446931522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212440401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2601571 + ... + 2602036.

It is an arithmetic number, because the mean of its divisors is an integer number (304411068).

Almost surely, 2^1212440431 is an apocalyptic number.

1212440431 is a deficient number, since it is larger than the sum of its proper divisors (5203841).

1212440431 is an equidigital number, since it uses as much as digits as its factorization.

1212440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5203840.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1212440431 is about 34820.1153214633. The cubic root of 1212440431 is about 1066.3181547738.

Adding to 1212440431 its reverse (1340442121), we get a palindrome (2552882552).

The spelling of 1212440431 in words is "one billion, two hundred twelve million, four hundred forty thousand, four hundred thirty-one".