397786018 has 32 divisors (see below), whose sum is σ = 712857600. Its totient is φ = 166309920.

The previous prime is 397786007. The next prime is 397786021. The reversal of 397786018 is 810687793.

It is a super-2 number, since 2×397786018² = 316467432232592648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21055 + ... + 35197.

It is an arithmetic number, because the mean of its divisors is an integer number (22276800).

Almost surely, 2^397786018 is an apocalyptic number.

397786018 is a deficient number, since it is larger than the sum of its proper divisors (315071582).

397786018 is a wasteful number, since it uses less digits than its factorization.

397786018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14207 (or 14193 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 397786018 is about 19944.5736479876. The cubic root of 397786018 is about 735.4443873501. Note that the first 3 decimals are identical.

It can be divided in two parts, 39778 and 6018, that added together give a square (45796 = 214²).

The spelling of 397786018 in words is "three hundred ninety-seven million, seven hundred eighty-six thousand, eighteen".