891385240 has 32 divisors (see below), whose sum is σ = 2092819680. Its totient is φ = 341051392.

The previous prime is 891385237. The next prime is 891385249. The reversal of 891385240 is 42583198.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 891385193 and 891385202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891385249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483529 + ... + 485368.

It is an arithmetic number, because the mean of its divisors is an integer number (65400615).

Almost surely, 2^891385240 is an apocalyptic number.

It is an amenable number.

891385240 is an abundant number, since it is smaller than the sum of its proper divisors (1201434440).

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

891385240 is a wasteful number, since it uses less digits than its factorization.

891385240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968931 (or 968927 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 891385240 is about 29856.0754286293. The cubic root of 891385240 is about 962.3989625767.

It can be divided in two parts, 89 and 1385240, that added together give a square (1385329 = 1177²).

The spelling of 891385240 in words is "eight hundred ninety-one million, three hundred eighty-five thousand, two hundred forty".