400193688 has 32 divisors (see below), whose sum is σ = 1006632000. Its totient is φ = 132578208.

The previous prime is 400193683. The next prime is 400193699. The reversal of 400193688 is 886391004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400193683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47238 + ... + 55061.

It is an arithmetic number, because the mean of its divisors is an integer number (31457250).

Almost surely, 2^400193688 is an apocalyptic number.

It is an amenable number.

400193688 is an abundant number, since it is smaller than the sum of its proper divisors (606438312).

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

400193688 is a wasteful number, since it uses less digits than its factorization.

400193688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102471 (or 102467 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 400193688 is about 20004.8416139694. The cubic root of 400193688 is about 736.9252059867.

The spelling of 400193688 in words is "four hundred million, one hundred ninety-three thousand, six hundred eighty-eight".