189949178345400 has 144 divisors (see below), whose sum is σ = 637981357885560. Its totient is φ = 50647659091200.

The previous prime is 189949178345389. The next prime is 189949178345401. The reversal of 189949178345400 is 4543871949981.

189949178345400 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 4 + 9 + 1 + 78 + 3 + 4 + 540 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189949178345401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11049615 + ... + 22405185.

Almost surely, 2^{189949178345400} is an apocalyptic number.

189949178345400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189949178345400 is an abundant number, since it is smaller than the sum of its proper divisors (448032179540160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189949178345400 is a wasteful number, since it uses less digits than its factorization.

189949178345400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364886 (or 11364874 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 72.

The spelling of 189949178345400 in words is "one hundred eighty-nine trillion, nine hundred forty-nine billion, one hundred seventy-eight million, three hundred forty-five thousand, four hundred".