1231654140 has 192 divisors, whose sum is σ = 4034257920. Its totient is φ = 311351040.

The previous prime is 1231654133. The next prime is 1231654153. The reversal of 1231654140 is 414561321.

It is a happy number.

1231654140 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 654 + 1 + 4 + 0 = 666.

1231654140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1626642 + ... + 1627398.

It is an arithmetic number, because the mean of its divisors is an integer number (21011760).

Almost surely, 2^1231654140 is an apocalyptic number.

1231654140 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 1231654140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017128960).

1231654140 is an abundant number, since it is smaller than the sum of its proper divisors (2802603780).

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

1231654140 is a wasteful number, since it uses less digits than its factorization.

1231654140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1231654140 is about 35094.9304031223. The cubic root of 1231654140 is about 1071.9213564031.

The spelling of 1231654140 in words is "one billion, two hundred thirty-one million, six hundred fifty-four thousand, one hundred forty".