397440143549 has 16 divisors (see below), whose sum is σ = 415633420800. Its totient is φ = 379726364160.

The previous prime is 397440143483. The next prime is 397440143557. The reversal of 397440143549 is 945341044793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 397440143549 - 2³² = 393145176253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397440143549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397440143249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94829 + ... + 896589.

It is an arithmetic number, because the mean of its divisors is an integer number (25977088800).

Almost surely, 2^397440143549 is an apocalyptic number.

It is an amenable number.

397440143549 is a deficient number, since it is larger than the sum of its proper divisors (18193277251).

397440143549 is a wasteful number, since it uses less digits than its factorization.

397440143549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802060.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 397440143549 in words is "three hundred ninety-seven billion, four hundred forty million, one hundred forty-three thousand, five hundred forty-nine".