999201438 has 24 divisors (see below), whose sum is σ = 2239590600. Its totient is φ = 321581904.

The previous prime is 999201407. The next prime is 999201439. The reversal of 999201438 is 834102999.

999201438 is a `hidden beast` number, since 9 + 9 + 9 + 201 + 438 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 999201393 and 999201402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999201439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 956568 + ... + 957611.

It is an arithmetic number, because the mean of its divisors is an integer number (93316275).

Almost surely, 2^999201438 is an apocalyptic number.

999201438 is an abundant number, since it is smaller than the sum of its proper divisors (1240389162).

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

999201438 is a wasteful number, since it uses less digits than its factorization.

999201438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914216 (or 1914213 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 999201438 is about 31610.1477060769. The cubic root of 999201438 is about 999.7337417795.

The spelling of 999201438 in words is "nine hundred ninety-nine million, two hundred one thousand, four hundred thirty-eight".