1605138954 has 8 divisors (see below), whose sum is σ = 3210277920. Its totient is φ = 535046316.

The previous prime is 1605138937. The next prime is 1605139007. The reversal of 1605138954 is 4598315061.

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

1605138954 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133761574 + ... + 133761585.

It is an arithmetic number, because the mean of its divisors is an integer number (401284740).

Almost surely, 2^1605138954 is an apocalyptic number.

1605138954 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.

1605138954 is a wasteful number, since it uses less digits than its factorization.

1605138954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267523164.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 1605138954 is about 40064.1854278856. The cubic root of 1605138954 is about 1170.8579564359.

The spelling of 1605138954 in words is "one billion, six hundred five million, one hundred thirty-eight thousand, nine hundred fifty-four".