397278500 has 24 divisors (see below), whose sum is σ = 867657336. Its totient is φ = 158911200.

The previous prime is 397278493. The next prime is 397278503. The reversal of 397278500 is 5872793.

It can be written as a sum of positive squares in 4 ways, for example, as 8952064 + 388326436 = 2992^2 + 19706^2 .

It is not an unprimeable number, because it can be changed into a prime (397278503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396779 + ... + 397778.

It is an arithmetic number, because the mean of its divisors is an integer number (36152389).

Almost surely, 2^397278500 is an apocalyptic number.

It is an amenable number.

397278500 is an abundant number, since it is smaller than the sum of its proper divisors (470378836).

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

397278500 is a wasteful number, since it uses less digits than its factorization.

397278500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794576 (or 794564 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 397278500 is about 19931.8463770921. The cubic root of 397278500 is about 735.1314803275.

The spelling of 397278500 in words is "three hundred ninety-seven million, two hundred seventy-eight thousand, five hundred".