861127540 has 48 divisors (see below), whose sum is σ = 2225688192. Its totient is φ = 272532096.

The previous prime is 861127507. The next prime is 861127541. The reversal of 861127540 is 45721168.

It is a junction number, because it is equal to n+sod(n) for n = 861127496 and 861127505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861127541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234754 + ... + 238393.

It is an arithmetic number, because the mean of its divisors is an integer number (46368504).

Almost surely, 2^861127540 is an apocalyptic number.

It is an amenable number.

861127540 is an abundant number, since it is smaller than the sum of its proper divisors (1364560652).

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

861127540 is a wasteful number, since it uses less digits than its factorization.

861127540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473176 (or 473174 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 861127540 is about 29344.9746975526. The cubic root of 861127540 is about 951.3839625467.

The spelling of 861127540 in words is "eight hundred sixty-one million, one hundred twenty-seven thousand, five hundred forty".