397785284 has 24 divisors (see below), whose sum is σ = 750223320. Its totient is φ = 183458304.

The previous prime is 397785277. The next prime is 397785287. The reversal of 397785284 is 482587793.

It can be written as a sum of positive squares in 4 ways, for example, as 139476100 + 258309184 = 11810^2 + 16072^2 .

It is not an unprimeable number, because it can be changed into a prime (397785287) 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, 118412 + ... + 121724.

It is an arithmetic number, because the mean of its divisors is an integer number (31259305).

Almost surely, 2^397785284 is an apocalyptic number.

It is an amenable number.

397785284 is a deficient number, since it is larger than the sum of its proper divisors (352438036).

397785284 is a wasteful number, since it uses less digits than its factorization.

397785284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639 (or 5637 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 53.

The square root of 397785284 is about 19944.5552469841. Note that the first 3 decimals coincide. The cubic root of 397785284 is about 735.4439349992.

The spelling of 397785284 in words is "three hundred ninety-seven million, seven hundred eighty-five thousand, two hundred eighty-four".