394275840 has 352 divisors, whose sum is σ = 1524933120. Its totient is φ = 84934656.

The previous prime is 394275839. The next prime is 394275841. The reversal of 394275840 is 48572493.

It is an interprime number because it is at equal distance from previous prime (394275839) and next prime (394275841).

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

It is a junction number, because it is equal to n+sod(n) for n = 394275792 and 394275801.

It is not an unprimeable number, because it can be changed into a prime (394275841) 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, 2042784 + ... + 2042976.

Almost surely, 2^394275840 is an apocalyptic number.

394275840 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 394275840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762466560).

394275840 is an abundant number, since it is smaller than the sum of its proper divisors (1130657280).

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

394275840 is a wasteful number, since it uses less digits than its factorization.

394275840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 394275840 is about 19856.3803347942. The cubic root of 394275840 is about 733.2747354463.

The spelling of 394275840 in words is "three hundred ninety-four million, two hundred seventy-five thousand, eight hundred forty".