397926950511 has 4 divisors (see below), whose sum is σ = 530569267352. Its totient is φ = 265284633672.

The previous prime is 397926950429. The next prime is 397926950521. The reversal of 397926950511 is 115059629793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115059629793 = 3 ⋅38353209931.

It is not a de Polignac number, because 397926950511 - 2¹⁵ = 397926917743 is a prime.

It is a super-2 number, since 2×397926950511² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397926950521) 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, 66321158416 + ... + 66321158421.

It is an arithmetic number, because the mean of its divisors is an integer number (132642316838).

Almost surely, 2^397926950511 is an apocalyptic number.

397926950511 is a deficient number, since it is larger than the sum of its proper divisors (132642316841).

397926950511 is a wasteful number, since it uses less digits than its factorization.

397926950511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132642316840.

The product of its (nonzero) digits is 4592700, while the sum is 57.

The spelling of 397926950511 in words is "three hundred ninety-seven billion, nine hundred twenty-six million, nine hundred fifty thousand, five hundred eleven".