394421400 has 240 divisors, whose sum is σ = 1389520440. Its totient is φ = 103680000.

The previous prime is 394421393. The next prime is 394421407. The reversal of 394421400 is 4124493.

It is an interprime number because it is at equal distance from previous prime (394421393) and next prime (394421407).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394421407) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1571275 + ... + 1571525.

Almost surely, 2^394421400 is an apocalyptic number.

394421400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394421400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694760220).

394421400 is an abundant number, since it is smaller than the sum of its proper divisors (995099040).

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

394421400 is a wasteful number, since it uses less digits than its factorization.

394421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 394421400 is about 19860.0453171688. The cubic root of 394421400 is about 733.3649619049.

Adding to 394421400 its reverse (4124493), we get a palindrome (398545893).

The spelling of 394421400 in words is "three hundred ninety-four million, four hundred twenty-one thousand, four hundred".