201687438 has 8 divisors (see below), whose sum is σ = 403374888. Its totient is φ = 67229144.

The previous prime is 201687401. The next prime is 201687463. The reversal of 201687438 is 834786102.

It is a sphenic number, since it is the product of 3 distinct primes.

201687438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 201687396 and 201687405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16807281 + ... + 16807292.

It is an arithmetic number, because the mean of its divisors is an integer number (50421861).

Almost surely, 2^201687438 is an apocalyptic number.

201687438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

201687438 is a wasteful number, since it uses less digits than its factorization.

201687438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33614578.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 201687438 is about 14201.6702538821. The cubic root of 201687438 is about 586.4436432033.

The spelling of 201687438 in words is "two hundred one million, six hundred eighty-seven thousand, four hundred thirty-eight".