1231863140 has 48 divisors (see below), whose sum is σ = 2674543872. Its totient is φ = 476292096.

The previous prime is 1231863109. The next prime is 1231863167. The reversal of 1231863140 is 413681321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76037 + ... + 90803.

It is an arithmetic number, because the mean of its divisors is an integer number (55719664).

Almost surely, 2^1231863140 is an apocalyptic number.

1231863140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231863140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1337271936).

1231863140 is an abundant number, since it is smaller than the sum of its proper divisors (1442680732).

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

1231863140 is a wasteful number, since it uses less digits than its factorization.

1231863140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14916 (or 14914 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1231863140 is about 35097.9079148601. The cubic root of 1231863140 is about 1071.9819845955.

The spelling of 1231863140 in words is "one billion, two hundred thirty-one million, eight hundred sixty-three thousand, one hundred forty".