438187940 has 24 divisors (see below), whose sum is σ = 930537720. Its totient is φ = 173305088.

The previous prime is 438187921. The next prime is 438187943. The reversal of 438187940 is 49781834.

It can be written as a sum of positive squares in 4 ways, for example, as 32809984 + 405377956 = 5728^2 + 20134^2 .

It is a super-2 number, since 2×438187940² = 384017341522887200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 438187891 and 438187900.

It is not an unprimeable number, because it can be changed into a prime (438187943) 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, 121307 + ... + 124866.

It is an arithmetic number, because the mean of its divisors is an integer number (38772405).

Almost surely, 2^438187940 is an apocalyptic number.

It is an amenable number.

438187940 is an abundant number, since it is smaller than the sum of its proper divisors (492349780).

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

438187940 is a wasteful number, since it uses less digits than its factorization.

438187940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246271 (or 246269 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 438187940 is about 20932.9391151840. The cubic root of 438187940 is about 759.5449376430.

The spelling of 438187940 in words is "four hundred thirty-eight million, one hundred eighty-seven thousand, nine hundred forty".