397440143551 has 8 divisors (see below), whose sum is σ = 433577409408. Its totient is φ = 361303935000.

The previous prime is 397440143483. The next prime is 397440143557. The reversal of 397440143551 is 155341044793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397440143551 - 2⁷ = 397440143423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397440143557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663166 + ... + 1111156.

It is an arithmetic number, because the mean of its divisors is an integer number (54197176176).

Almost surely, 2^397440143551 is an apocalyptic number.

397440143551 is a deficient number, since it is larger than the sum of its proper divisors (36137265857).

397440143551 is a wasteful number, since it uses less digits than its factorization.

397440143551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528653.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 397440143551 in words is "three hundred ninety-seven billion, four hundred forty million, one hundred forty-three thousand, five hundred fifty-one".