394944480 has 144 divisors (see below), whose sum is σ = 1540322784. Its totient is φ = 90270720.

The previous prime is 394944457. The next prime is 394944503. The reversal of 394944480 is 84449493.

It is an interprime number because it is at equal distance from previous prime (394944457) and next prime (394944503).

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×394944480² = 311962284564940800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9511 + ... + 29670.

It is an arithmetic number, because the mean of its divisors is an integer number (10696686).

Almost surely, 2^394944480 is an apocalyptic number.

394944480 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 394944480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770161392).

394944480 is an abundant number, since it is smaller than the sum of its proper divisors (1145378304).

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

394944480 is a wasteful number, since it uses less digits than its factorization.

394944480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39209 (or 39198 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 394944480 is about 19873.2101080827. The cubic root of 394944480 is about 733.6890138699.

The spelling of 394944480 in words is "three hundred ninety-four million, nine hundred forty-four thousand, four hundred eighty".