397238040 has 128 divisors (see below), whose sum is σ = 1337356800. Its totient is φ = 104872320.

The previous prime is 397238011. The next prime is 397238047. The reversal of 397238040 is 40832793.

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 = 397237986 and 397238004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397238047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109455 + ... + 113025.

It is an arithmetic number, because the mean of its divisors is an integer number (10448100).

Almost surely, 2^397238040 is an apocalyptic number.

397238040 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 397238040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668678400).

397238040 is an abundant number, since it is smaller than the sum of its proper divisors (940118760).

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

397238040 is a wasteful number, since it uses less digits than its factorization.

397238040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694 (or 3684 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 397238040 is about 19930.8313925937. The cubic root of 397238040 is about 735.1065235029.

The spelling of 397238040 in words is "three hundred ninety-seven million, two hundred thirty-eight thousand, forty".