397932047 has 4 divisors (see below), whose sum is σ = 398147736. Its totient is φ = 397716360.

The previous prime is 397932023. The next prime is 397932053. The reversal of 397932047 is 740239793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740239793 = 31 ⋅23878703.

It is a cyclic number.

It is not a de Polignac number, because 397932047 - 2¹⁸ = 397669903 is a prime.

It is a super-2 number, since 2×397932047² = 316699828059220418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397931989 and 397932007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397932547) 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, 105053 + ... + 108774.

It is an arithmetic number, because the mean of its divisors is an integer number (99536934).

Almost surely, 2^397932047 is an apocalyptic number.

397932047 is a deficient number, since it is larger than the sum of its proper divisors (215689).

397932047 is a wasteful number, since it uses less digits than its factorization.

397932047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215688.

The product of its (nonzero) digits is 285768, while the sum is 44.

The square root of 397932047 is about 19948.2341825035. The cubic root of 397932047 is about 735.5343712982.

The spelling of 397932047 in words is "three hundred ninety-seven million, nine hundred thirty-two thousand, forty-seven".