397842786 has 64 divisors (see below), whose sum is σ = 1015257600. Its totient is φ = 114210000.

The previous prime is 397842763. The next prime is 397842791. The reversal of 397842786 is 687248793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon 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, 6340 + ... + 28911.

It is an arithmetic number, because the mean of its divisors is an integer number (15863400).

Almost surely, 2^397842786 is an apocalyptic number.

397842786 is an abundant number, since it is smaller than the sum of its proper divisors (617414814).

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

397842786 is a wasteful number, since it uses less digits than its factorization.

397842786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35292 (or 35286 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 397842786 is about 19945.9967412010. The cubic root of 397842786 is about 735.4793707492.

It can be divided in two parts, 3978 and 42786, that added together give a palindrome (46764).

The spelling of 397842786 in words is "three hundred ninety-seven million, eight hundred forty-two thousand, seven hundred eighty-six".