1916557538 has 16 divisors (see below), whose sum is σ = 3327118080. Its totient is φ = 810984096.

The previous prime is 1916557483. The next prime is 1916557567. The reversal of 1916557538 is 8357556191.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865331 + ... + 867542.

It is an arithmetic number, because the mean of its divisors is an integer number (207944880).

Almost surely, 2^1916557538 is an apocalyptic number.

1916557538 is a deficient number, since it is larger than the sum of its proper divisors (1410560542).

1916557538 is a wasteful number, since it uses less digits than its factorization.

1916557538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732961.

The product of its digits is 1134000, while the sum is 50.

The square root of 1916557538 is about 43778.5054336029. The cubic root of 1916557538 is about 1242.1497434246.

The spelling of 1916557538 in words is "one billion, nine hundred sixteen million, five hundred fifty-seven thousand, five hundred thirty-eight".