194371640 has 32 divisors (see below), whose sum is σ = 438372000. Its totient is φ = 77564544.

The previous prime is 194371633. The next prime is 194371663. The reversal of 194371640 is 46173491.

It is a self number, because there is not a number n which added to its sum of digits gives 194371640.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12026 + ... + 23094.

It is an arithmetic number, because the mean of its divisors is an integer number (13699125).

Almost surely, 2^194371640 is an apocalyptic number.

194371640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194371640 is an abundant number, since it is smaller than the sum of its proper divisors (244000360).

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

194371640 is a wasteful number, since it uses less digits than its factorization.

194371640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11519 (or 11515 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 194371640 is about 13941.7229925142. The cubic root of 194371640 is about 579.2654593533.

The spelling of 194371640 in words is "one hundred ninety-four million, three hundred seventy-one thousand, six hundred forty".