397964238 has 64 divisors (see below), whose sum is σ = 926607360. Its totient is φ = 111601152.

The previous prime is 397964221. The next prime is 397964251. The reversal of 397964238 is 832469793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 918870 + ... + 919302.

It is an arithmetic number, because the mean of its divisors is an integer number (14478240).

Almost surely, 2^397964238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397964238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463303680).

397964238 is an abundant number, since it is smaller than the sum of its proper divisors (528643122).

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

397964238 is a wasteful number, since it uses less digits than its factorization.

397964238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801.

The product of its digits is 1959552, while the sum is 51.

The square root of 397964238 is about 19949.0410295834. The cubic root of 397964238 is about 735.5542046246.

The spelling of 397964238 in words is "three hundred ninety-seven million, nine hundred sixty-four thousand, two hundred thirty-eight".