18400229694 has 144 divisors (see below), whose sum is σ = 50273399904. Its totient is φ = 4760933760.

The previous prime is 18400229677. The next prime is 18400229711. The reversal of 18400229694 is 49692200481.

18400229694 is a `hidden beast` number, since 18 + 400 + 229 + 6 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (18400229677) and next prime (18400229711).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4220964 + ... + 4225320.

Almost surely, 2^18400229694 is an apocalyptic number.

18400229694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18400229694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25136699952).

18400229694 is an abundant number, since it is smaller than the sum of its proper divisors (31873170210).

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

18400229694 is a wasteful number, since it uses less digits than its factorization.

18400229694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671 (or 4657 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 18400229694 in words is "eighteen billion, four hundred million, two hundred twenty-nine thousand, six hundred ninety-four".