394129428 has 144 divisors (see below), whose sum is σ = 1223736192. Its totient is φ = 96307200.

The previous prime is 394129399. The next prime is 394129441. The reversal of 394129428 is 824921493.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 394129428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 171648 + ... + 173928.

It is an arithmetic number, because the mean of its divisors is an integer number (8498168).

Almost surely, 2^394129428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394129428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611868096).

394129428 is an abundant number, since it is smaller than the sum of its proper divisors (829606764).

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

394129428 is a wasteful number, since it uses less digits than its factorization.

394129428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334 (or 2321 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 394129428 is about 19852.6932177979. The cubic root of 394129428 is about 733.1839584643.

The spelling of 394129428 in words is "three hundred ninety-four million, one hundred twenty-nine thousand, four hundred twenty-eight".