1231955428 has 24 divisors (see below), whose sum is σ = 2356865280. Its totient is φ = 558801120.

The previous prime is 1231955411. The next prime is 1231955429. The reversal of 1231955428 is 8245591321.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1231955429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8151 + ... + 50302.

It is an arithmetic number, because the mean of its divisors is an integer number (98202720).

Almost surely, 2^1231955428 is an apocalyptic number.

It is an amenable number.

1231955428 is a deficient number, since it is larger than the sum of its proper divisors (1124909852).

1231955428 is a wasteful number, since it uses less digits than its factorization.

1231955428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58947 (or 58945 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 1231955428 is about 35099.2226124739. Note that the first 3 decimals coincide. The cubic root of 1231955428 is about 1072.0087539662.

It can be divided in two parts, 1231 and 955428, that added together give a palindrome (956659).

The spelling of 1231955428 in words is "one billion, two hundred thirty-one million, nine hundred fifty-five thousand, four hundred twenty-eight".