394821390 has 64 divisors (see below), whose sum is σ = 975240000. Its totient is φ = 102236160.

The previous prime is 394821367. The next prime is 394821397. The reversal of 394821390 is 93128493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394821397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315486 + ... + 316734.

It is an arithmetic number, because the mean of its divisors is an integer number (15238125).

Almost surely, 2^394821390 is an apocalyptic number.

394821390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 394821390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487620000).

394821390 is an abundant number, since it is smaller than the sum of its proper divisors (580418610).

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

394821390 is a wasteful number, since it uses less digits than its factorization.

394821390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 394821390 is about 19870.1129840774. The cubic root of 394821390 is about 733.6127844511.

The spelling of 394821390 in words is "three hundred ninety-four million, eight hundred twenty-one thousand, three hundred ninety".