1231404405 has 64 divisors (see below), whose sum is σ = 2464598016. Its totient is φ = 510048000.

The previous prime is 1231404341. The next prime is 1231404407. The reversal of 1231404405 is 5044041321.

It is not a de Polignac number, because 1231404405 - 2⁶ = 1231404341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231404407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 380695 + ... + 383915.

It is an arithmetic number, because the mean of its divisors is an integer number (38509344).

Almost surely, 2^1231404405 is an apocalyptic number.

1231404405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231404405 is an abundant number, since it is smaller than the sum of its proper divisors (1233193611).

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

1231404405 is a wasteful number, since it uses less digits than its factorization.

1231404405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1231404405 is about 35091.3722302221. The cubic root of 1231404405 is about 1071.8489025200.

Adding to 1231404405 its reverse (5044041321), we get a palindrome (6275445726).

The spelling of 1231404405 in words is "one billion, two hundred thirty-one million, four hundred four thousand, four hundred five".