397440143505 has 32 divisors (see below), whose sum is σ = 722991899520. Its totient is φ = 207038583360.

The previous prime is 397440143483. The next prime is 397440143557. The reversal of 397440143505 is 505341044793.

397440143505 is a `hidden beast` number, since 3 + 97 + 4 + 40 + 14 + 3 + 505 = 666.

It is not a de Polignac number, because 397440143505 - 2⁸ = 397440143249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34226766 + ... + 34238375.

It is an arithmetic number, because the mean of its divisors is an integer number (22593496860).

Almost surely, 2^397440143505 is an apocalyptic number.

It is an amenable number.

397440143505 is a deficient number, since it is larger than the sum of its proper divisors (325551756015).

397440143505 is a wasteful number, since it uses less digits than its factorization.

397440143505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68465198 (or 68465192 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 397440143505 in words is "three hundred ninety-seven billion, four hundred forty million, one hundred forty-three thousand, five hundred five".