891225738 has 96 divisors (see below), whose sum is σ = 2187516240. Its totient is φ = 260305920.

The previous prime is 891225737. The next prime is 891225763. The reversal of 891225738 is 837522198.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1814409 + 889411329 = 1347^2 + 29823^2 .

It is a junction number, because it is equal to n+sod(n) for n = 891225693 and 891225702.

It is not an unprimeable number, because it can be changed into a prime (891225737) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 412870 + ... + 415022.

Almost surely, 2^891225738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891225738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093758120).

891225738 is an abundant number, since it is smaller than the sum of its proper divisors (1296290502).

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

891225738 is a wasteful number, since it uses less digits than its factorization.

891225738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 2261 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 891225738 is about 29853.4041275028. The cubic root of 891225738 is about 962.3415561531.

The spelling of 891225738 in words is "eight hundred ninety-one million, two hundred twenty-five thousand, seven hundred thirty-eight".