189493381 has 24 divisors (see below), whose sum is σ = 239059520. Its totient is φ = 147026880.

The previous prime is 189493379. The next prime is 189493393. The reversal of 189493381 is 183394981.

189493381 = 294² + 295² + ... + 840².

It is a happy number.

It is not a de Polignac number, because 189493381 - 2¹ = 189493379 is a prime.

It is a super-2 number, since 2×189493381² = 71815482885622322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189493361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346150 + ... + 346696.

Almost surely, 2^189493381 is an apocalyptic number.

189493381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189493381 is a deficient number, since it is larger than the sum of its proper divisors (49566139).

189493381 is a wasteful number, since it uses less digits than its factorization.

189493381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 974 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 189493381 is about 13765.6594829307. The cubic root of 189493381 is about 574.3782880740.

The spelling of 189493381 in words is "one hundred eighty-nine million, four hundred ninety-three thousand, three hundred eighty-one".