1231434399 has 8 divisors (see below), whose sum is σ = 1768213552. Its totient is φ = 757805760.

The previous prime is 1231434341. The next prime is 1231434401. The reversal of 1231434399 is 9934341321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231434399 - 2⁷ = 1231434271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 31575241 = 1231434399 / (1 + 2 + 3 + 1 + 4 + 3 + 4 + 3 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231430399) 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, 15787582 + ... + 15787659.

It is an arithmetic number, because the mean of its divisors is an integer number (221026694).

Almost surely, 2^1231434399 is an apocalyptic number.

1231434399 is a deficient number, since it is larger than the sum of its proper divisors (536779153).

1231434399 is a wasteful number, since it uses less digits than its factorization.

1231434399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31575257.

The product of its digits is 69984, while the sum is 39.

The square root of 1231434399 is about 35091.7995976268. The cubic root of 1231434399 is about 1071.8576049888.

The spelling of 1231434399 in words is "one billion, two hundred thirty-one million, four hundred thirty-four thousand, three hundred ninety-nine".