397597971 has 32 divisors (see below), whose sum is σ = 583188480. Its totient is φ = 239997600.

The previous prime is 397597897. The next prime is 397597973. The reversal of 397597971 is 179795793.

It is not a de Polignac number, because 397597971 - 2¹¹ = 397595923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (397597973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145306 + ... + 148016.

It is an arithmetic number, because the mean of its divisors is an integer number (18224640).

Almost surely, 2^397597971 is an apocalyptic number.

397597971 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

397597971 is a deficient number, since it is larger than the sum of its proper divisors (185590509).

397597971 is a wasteful number, since it uses less digits than its factorization.

397597971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847.

The product of its digits is 3750705, while the sum is 57.

The square root of 397597971 is about 19939.8588510551. The cubic root of 397597971 is about 735.3284792128.

The spelling of 397597971 in words is "three hundred ninety-seven million, five hundred ninety-seven thousand, nine hundred seventy-one".