1230143640 has 128 divisors (see below), whose sum is σ = 4066225920. Its totient is φ = 295232000.

The previous prime is 1230143639. The next prime is 1230143693. The reversal of 1230143640 is 463410321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1230143640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128707 + ... + 137933.

It is an arithmetic number, because the mean of its divisors is an integer number (31767390).

Almost surely, 2^1230143640 is an apocalyptic number.

1230143640 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 1230143640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2033112960).

1230143640 is an abundant number, since it is smaller than the sum of its proper divisors (2836082280).

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

1230143640 is a wasteful number, since it uses less digits than its factorization.

1230143640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353 (or 9349 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1230143640 is about 35073.4035987385. The cubic root of 1230143640 is about 1071.4829758787.

Adding to 1230143640 its reverse (463410321), we get a palindrome (1693553961).

The spelling of 1230143640 in words is "one billion, two hundred thirty million, one hundred forty-three thousand, six hundred forty".