1231200440 has 16 divisors (see below), whose sum is σ = 2770201080. Its totient is φ = 492480160.

The previous prime is 1231200389. The next prime is 1231200449. The reversal of 1231200440 is 440021321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231200449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15389966 + ... + 15390045.

Almost surely, 2^1231200440 is an apocalyptic number.

1231200440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231200440 is an abundant number, since it is smaller than the sum of its proper divisors (1539000640).

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

1231200440 is a wasteful number, since it uses less digits than its factorization.

1231200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30780022 (or 30780018 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1231200440 is about 35088.4659111794. The cubic root of 1231200440 is about 1071.7897203017.

Adding to 1231200440 its reverse (440021321), we get a palindrome (1671221761).

The spelling of 1231200440 in words is "one billion, two hundred thirty-one million, two hundred thousand, four hundred forty".