189403490 has 24 divisors (see below), whose sum is σ = 352296540. Its totient is φ = 73313760.

The previous prime is 189403471. The next prime is 189403493. The reversal of 189403490 is 94304981.

It can be written as a sum of positive squares in 2 ways, for example, as 188595289 + 808201 = 13733^2 + 899^2 .

It is not an unprimeable number, because it can be changed into a prime (189403493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245 + ... + 19464.

Almost surely, 2^189403490 is an apocalyptic number.

189403490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189403490 is a deficient number, since it is larger than the sum of its proper divisors (162893050).

189403490 is a wasteful number, since it uses less digits than its factorization.

189403490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19778 (or 19747 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 189403490 is about 13762.3940504550. The cubic root of 189403490 is about 574.2874500638.

The spelling of 189403490 in words is "one hundred eighty-nine million, four hundred three thousand, four hundred ninety".