1231169240 has 128 divisors (see below), whose sum is σ = 3372969600. Its totient is φ = 394813440.

The previous prime is 1231169221. The next prime is 1231169263. The reversal of 1231169240 is 429611321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860846 + ... + 862274.

It is an arithmetic number, because the mean of its divisors is an integer number (26351325).

Almost surely, 2^1231169240 is an apocalyptic number.

1231169240 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 1231169240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1686484800).

1231169240 is an abundant number, since it is smaller than the sum of its proper divisors (2141800360).

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

1231169240 is a wasteful number, since it uses less digits than its factorization.

1231169240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645 (or 1641 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1231169240 is about 35088.0213178230. The cubic root of 1231169240 is about 1071.7806667741.

The spelling of 1231169240 in words is "one billion, two hundred thirty-one million, one hundred sixty-nine thousand, two hundred forty".