1231867494840 has 32 divisors (see below), whose sum is σ = 3695602484880. Its totient is φ = 328497998592.

The previous prime is 1231867494829. The next prime is 1231867494929. The reversal of 1231867494840 is 484947681321.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5132781109 + ... + 5132781348.

Almost surely, 2^{1231867494840} is an apocalyptic number.

1231867494840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231867494840 is an abundant number, since it is smaller than the sum of its proper divisors (2463734990040).

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

1231867494840 is a wasteful number, since it uses less digits than its factorization.

1231867494840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265562471 (or 10265562467 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 57.

The spelling of 1231867494840 in words is "one trillion, two hundred thirty-one billion, eight hundred sixty-seven million, four hundred ninety-four thousand, eight hundred forty".