394440156 has 216 divisors, whose sum is σ = 1189773312. Its totient is φ = 109771200.

The previous prime is 394440143. The next prime is 394440157. The reversal of 394440156 is 651044493.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 394440156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394440157) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3105765 + ... + 3105891.

Almost surely, 2^394440156 is an apocalyptic number.

394440156 is a gapful number since it is divisible by the number (36) 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 394440156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594886656).

394440156 is an abundant number, since it is smaller than the sum of its proper divisors (795333156).

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

394440156 is a wasteful number, since it uses less digits than its factorization.

394440156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 394440156 is about 19860.5175159158. The cubic root of 394440156 is about 733.3765863377.

It can be divided in two parts, 3944 and 40156, that added together give a square (44100 = 210²).

The spelling of 394440156 in words is "three hundred ninety-four million, four hundred forty thousand, one hundred fifty-six".