394259040 has 144 divisors (see below), whose sum is σ = 1537649568. Its totient is φ = 90114048.

The previous prime is 394259039. The next prime is 394259069. The reversal of 394259040 is 40952493.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 394258986 and 394259004.

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, 9477 + ... + 29636.

It is an arithmetic number, because the mean of its divisors is an integer number (10678122).

Almost surely, 2^394259040 is an apocalyptic number.

394259040 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 394259040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768824784).

394259040 is an abundant number, since it is smaller than the sum of its proper divisors (1143390528).

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

394259040 is a wasteful number, since it uses less digits than its factorization.

394259040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39141 (or 39130 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 394259040 is about 19855.9572924601. The cubic root of 394259040 is about 733.2643204109.

The spelling of 394259040 in words is "three hundred ninety-four million, two hundred fifty-nine thousand, forty".