1908393381 has 24 divisors (see below), whose sum is σ = 2789242560. Its totient is φ = 1257250176.

The previous prime is 1908393379. The next prime is 1908393397. The reversal of 1908393381 is 1833938091.

It is a happy number.

1908393381 is a `hidden beast` number, since 190 + 83 + 9 + 3 + 381 = 666.

It is not a de Polignac number, because 1908393381 - 2¹ = 1908393379 is a prime.

It is a super-2 number, since 2×1908393381² = 7283930593289222322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1908393301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362490 + ... + 367716.

It is an arithmetic number, because the mean of its divisors is an integer number (116218440).

Almost surely, 2^1908393381 is an apocalyptic number.

It is an amenable number.

1908393381 is a deficient number, since it is larger than the sum of its proper divisors (880849179).

1908393381 is a wasteful number, since it uses less digits than its factorization.

1908393381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705 (or 5702 counting only the distinct ones).

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

The square root of 1908393381 is about 43685.1620232774. The cubic root of 1908393381 is about 1240.3834620931.

The spelling of 1908393381 in words is "one billion, nine hundred eight million, three hundred ninety-three thousand, three hundred eighty-one".