100400394 has 8 divisors (see below), whose sum is σ = 200800800. Its totient is φ = 33466796.

The previous prime is 100400393. The next prime is 100400437. The reversal of 100400394 is 493004001.

It is a sphenic number, since it is the product of 3 distinct primes.

100400394 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 100400394.

It is not an unprimeable number, because it can be changed into a prime (100400393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8366694 + ... + 8366705.

It is an arithmetic number, because the mean of its divisors is an integer number (25100100).

Almost surely, 2^100400394 is an apocalyptic number.

100400394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

100400394 is a wasteful number, since it uses less digits than its factorization.

100400394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16733404.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 100400394 is about 10019.9997005988. Note that the first 3 decimals coincide. The cubic root of 100400394 is about 464.7775465043. Note that the first 3 decimals are identical.

Adding to 100400394 its reverse (493004001), we get a palindrome (593404395).

The spelling of 100400394 in words is "one hundred million, four hundred thousand, three hundred ninety-four".