397642766 has 8 divisors (see below), whose sum is σ = 615705024. Its totient is φ = 192407760.

The previous prime is 397642759. The next prime is 397642769. The reversal of 397642766 is 667246793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×397642766³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397642769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3206735 + ... + 3206858.

It is an arithmetic number, because the mean of its divisors is an integer number (76963128).

Almost surely, 2^397642766 is an apocalyptic number.

397642766 is a deficient number, since it is larger than the sum of its proper divisors (218062258).

397642766 is a wasteful number, since it uses less digits than its factorization.

397642766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413626.

The product of its digits is 2286144, while the sum is 50.

The square root of 397642766 is about 19940.9820721047. The cubic root of 397642766 is about 735.3560932054.

The spelling of 397642766 in words is "three hundred ninety-seven million, six hundred forty-two thousand, seven hundred sixty-six".