397426548491 has 16 divisors (see below), whose sum is σ = 471833123328. Its totient is φ = 327661857600.

The previous prime is 397426548481. The next prime is 397426548503. The reversal of 397426548491 is 194845624793.

It is not a de Polignac number, because 397426548491 - 2¹⁰ = 397426547467 is a prime.

It is a super-2 number, since 2×397426548491² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397426548401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9731465 + ... + 9772218.

It is an arithmetic number, because the mean of its divisors is an integer number (29489570208).

Almost surely, 2^397426548491 is an apocalyptic number.

397426548491 is a deficient number, since it is larger than the sum of its proper divisors (74406574837).

397426548491 is a wasteful number, since it uses less digits than its factorization.

397426548491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19503802.

The product of its digits is 52254720, while the sum is 62.

The spelling of 397426548491 in words is "three hundred ninety-seven billion, four hundred twenty-six million, five hundred forty-eight thousand, four hundred ninety-one".