397932280 has 64 divisors (see below), whose sum is σ = 923244480. Its totient is φ = 154291200.

The previous prime is 397932259. The next prime is 397932289. The reversal of 397932280 is 82239793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397932289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172092 + ... + 174388.

It is an arithmetic number, because the mean of its divisors is an integer number (14425695).

Almost surely, 2^397932280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397932280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461622240).

397932280 is an abundant number, since it is smaller than the sum of its proper divisors (525312200).

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

397932280 is a wasteful number, since it uses less digits than its factorization.

397932280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2436 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 397932280 is about 19948.2400226185. The cubic root of 397932280 is about 735.5345148566.

The spelling of 397932280 in words is "three hundred ninety-seven million, nine hundred thirty-two thousand, two hundred eighty".