394932780 has 192 divisors, whose sum is σ = 1419586560. Its totient is φ = 90086400.

The previous prime is 394932761. The next prime is 394932809. The reversal of 394932780 is 87239493.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 99025 + ... + 102935.

It is an arithmetic number, because the mean of its divisors is an integer number (7393680).

Almost surely, 2^394932780 is an apocalyptic number.

394932780 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 394932780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709793280).

394932780 is an abundant number, since it is smaller than the sum of its proper divisors (1024653780).

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

394932780 is a wasteful number, since it uses less digits than its factorization.

394932780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957 (or 3949 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 394932780 is about 19872.9157397700. The cubic root of 394932780 is about 733.6817687619.

The spelling of 394932780 in words is "three hundred ninety-four million, nine hundred thirty-two thousand, seven hundred eighty".