1231355040 has 96 divisors (see below), whose sum is σ = 4082944320. Its totient is φ = 311076864.

The previous prime is 1231355029. The next prime is 1231355053. The reversal of 1231355040 is 405531321.

It is a tau number, because it is divible by the number of its divisors (96).

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 1231355040.

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, 58389 + ... + 76628.

It is an arithmetic number, because the mean of its divisors is an integer number (42530670).

Almost surely, 2^1231355040 is an apocalyptic number.

1231355040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231355040 is an abundant number, since it is smaller than the sum of its proper divisors (2851589280).

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

1231355040 is a wasteful number, since it uses less digits than its factorization.

1231355040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135054 (or 135046 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1231355040 is about 35090.6688451503. The cubic root of 1231355040 is about 1071.8345794355.

Adding to 1231355040 its reverse (405531321), we get a palindrome (1636886361).

The spelling of 1231355040 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, forty".