1231235406 has 24 divisors (see below), whose sum is σ = 2724437664. Its totient is φ = 401679360.

The previous prime is 1231235381. The next prime is 1231235417. The reversal of 1231235406 is 6045321321.

1231235406 is a `hidden beast` number, since 1 + 23 + 1 + 235 + 406 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1231235406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 726835 + ... + 728526.

It is an arithmetic number, because the mean of its divisors is an integer number (113518236).

Almost surely, 2^1231235406 is an apocalyptic number.

1231235406 is an abundant number, since it is smaller than the sum of its proper divisors (1493202258).

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

1231235406 is a wasteful number, since it uses less digits than its factorization.

1231235406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455416 (or 1455413 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1231235406 is about 35088.9641625398. The cubic root of 1231235406 is about 1071.7998664549.

Adding to 1231235406 its reverse (6045321321), we get a palindrome (7276556727).

The spelling of 1231235406 in words is "one billion, two hundred thirty-one million, two hundred thirty-five thousand, four hundred six".