397203840 has 192 divisors, whose sum is σ = 1496523600. Its totient is φ = 96276480.

The previous prime is 397203787. The next prime is 397203847. The reversal of 397203840 is 48302793.

It is a tau number, because it is divible by the number of its divisors (192).

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 = 397203795 and 397203804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397203847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60226 + ... + 66494.

Almost surely, 2^397203840 is an apocalyptic number.

397203840 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 397203840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748261800).

397203840 is an abundant number, since it is smaller than the sum of its proper divisors (1099319760).

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

397203840 is a wasteful number, since it uses less digits than its factorization.

397203840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6290 counting only the distinct ones).

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

The square root of 397203840 is about 19929.9734069065. The cubic root of 397203840 is about 735.0854266944.

The spelling of 397203840 in words is "three hundred ninety-seven million, two hundred three thousand, eight hundred forty".