1231425440 has 48 divisors (see below), whose sum is σ = 3324851712. Its totient is φ = 422202624.

The previous prime is 1231425439. The next prime is 1231425467. The reversal of 1231425440 is 445241321.

It is a super-2 number, since 2×1231425440² = 3032817228558387200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548624 + ... + 550863.

It is an arithmetic number, because the mean of its divisors is an integer number (69267744).

Almost surely, 2^1231425440 is an apocalyptic number.

1231425440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231425440 is an abundant number, since it is smaller than the sum of its proper divisors (2093426272).

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

1231425440 is a wasteful number, since it uses less digits than its factorization.

1231425440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099509 (or 1099501 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1231425440 is about 35091.6719464890. The cubic root of 1231425440 is about 1071.8550056364.

Adding to 1231425440 its reverse (445241321), we get a palindrome (1676666761).

The spelling of 1231425440 in words is "one billion, two hundred thirty-one million, four hundred twenty-five thousand, four hundred forty".