194399407840 has 96 divisors (see below), whose sum is σ = 517182382080. Its totient is φ = 68410329600.

The previous prime is 194399407781. The next prime is 194399407907. The reversal of 194399407840 is 48704993491.

It is a super-2 number, since 2×194399407840² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1726960 + ... + 1836079.

It is an arithmetic number, because the mean of its divisors is an integer number (5387316480).

Almost surely, 2^194399407840 is an apocalyptic number.

194399407840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194399407840 is an abundant number, since it is smaller than the sum of its proper divisors (322782974240).

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

194399407840 is a wasteful number, since it uses less digits than its factorization.

194399407840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563096 (or 3563088 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 194399407840 in words is "one hundred ninety-four billion, three hundred ninety-nine million, four hundred seven thousand, eight hundred forty".