189690017450 has 24 divisors (see below), whose sum is σ = 352842877920. Its totient is φ = 75871825200.

The previous prime is 189690017393. The next prime is 189690017453. The reversal of 189690017450 is 54710096981.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (189690017453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 909041 + ... + 1098059.

It is an arithmetic number, because the mean of its divisors is an integer number (14701786580).

Almost surely, 2^189690017450 is an apocalyptic number.

189690017450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189690017450 is a deficient number, since it is larger than the sum of its proper divisors (163152860470).

189690017450 is a wasteful number, since it uses less digits than its factorization.

189690017450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209102 (or 209097 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 189690017450 in words is "one hundred eighty-nine billion, six hundred ninety million, seventeen thousand, four hundred fifty".