1538723934 has 96 divisors (see below), whose sum is σ = 3786588000. Its totient is φ = 447310080.

The previous prime is 1538723933. The next prime is 1538723939. The reversal of 1538723934 is 4393278351.

1538723934 is a `hidden beast` number, since 1 + 5 + 387 + 239 + 34 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538723934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538723933) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 992592 + ... + 994140.

It is an arithmetic number, because the mean of its divisors is an integer number (39443625).

Almost surely, 2^1538723934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538723934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1893294000).

1538723934 is an abundant number, since it is smaller than the sum of its proper divisors (2247864066).

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

1538723934 is a wasteful number, since it uses less digits than its factorization.

1538723934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1767 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 1538723934 is about 39226.5717849521. The cubic root of 1538723934 is about 1154.4813007965.

The spelling of 1538723934 in words is "one billion, five hundred thirty-eight million, seven hundred twenty-three thousand, nine hundred thirty-four".