891040238 has 16 divisors (see below), whose sum is σ = 1491975936. Its totient is φ = 395598840.

The previous prime is 891040219. The next prime is 891040301. The reversal of 891040238 is 832040198.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 891040198 and 891040207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470006 + ... + 471897.

It is an arithmetic number, because the mean of its divisors is an integer number (93248496).

Almost surely, 2^891040238 is an apocalyptic number.

891040238 is a deficient number, since it is larger than the sum of its proper divisors (600935698).

891040238 is a wasteful number, since it uses less digits than its factorization.

891040238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941959.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 891040238 is about 29850.2971174493. The cubic root of 891040238 is about 962.2747841641.

The spelling of 891040238 in words is "eight hundred ninety-one million, forty thousand, two hundred thirty-eight".