397977983 has 4 divisors (see below), whose sum is σ = 428591688. Its totient is φ = 367364280.

The previous prime is 397977941. The next prime is 397978027. The reversal of 397977983 is 389779793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397977983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397970983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15306833 + ... + 15306858.

It is an arithmetic number, because the mean of its divisors is an integer number (107147922).

Almost surely, 2^397977983 is an apocalyptic number.

397977983 is a deficient number, since it is larger than the sum of its proper divisors (30613705).

397977983 is a wasteful number, since it uses less digits than its factorization.

397977983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30613704.

The product of its digits is 18003384, while the sum is 62.

The square root of 397977983 is about 19949.3855293841. The cubic root of 397977983 is about 735.5626727860.

The spelling of 397977983 in words is "three hundred ninety-seven million, nine hundred seventy-seven thousand, nine hundred eighty-three".