1231342420 has 48 divisors (see below), whose sum is σ = 3223882368. Its totient is φ = 383794560.

The previous prime is 1231342417. The next prime is 1231342423. The reversal of 1231342420 is 242431321.

It is an interprime number because it is at equal distance from previous prime (1231342417) and next prime (1231342423).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1231342391 and 1231342400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231342423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398247 + ... + 401326.

It is an arithmetic number, because the mean of its divisors is an integer number (67164216).

Almost surely, 2^1231342420 is an apocalyptic number.

1231342420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231342420 is an abundant number, since it is smaller than the sum of its proper divisors (1992539948).

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

1231342420 is a wasteful number, since it uses less digits than its factorization.

1231342420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799600 (or 799598 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1231342420 is about 35090.4890248056. The cubic root of 1231342420 is about 1071.8309177246.

Adding to 1231342420 its reverse (242431321), we get a palindrome (1473773741).

The spelling of 1231342420 in words is "one billion, two hundred thirty-one million, three hundred forty-two thousand, four hundred twenty".