438423823240 has 64 divisors (see below), whose sum is σ = 1091046443760. Its totient is φ = 157504435200.

The previous prime is 438423823231. The next prime is 438423823247. The reversal of 438423823240 is 42328324834.

It can be written as a sum of positive squares in 8 ways, for example, as 225535708836 + 212888114404 = 474906^2 + 461398^2 .

It is not an unprimeable number, because it can be changed into a prime (438423823247) 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, 11374311 + ... + 11412790.

Almost surely, 2^438423823240 is an apocalyptic number.

438423823240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438423823240 is an abundant number, since it is smaller than the sum of its proper divisors (652622620520).

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

438423823240 is a wasteful number, since it uses less digits than its factorization.

438423823240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22787162 (or 22787158 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 438423823240 in words is "four hundred thirty-eight billion, four hundred twenty-three million, eight hundred twenty-three thousand, two hundred forty".