397440143550 has 72 divisors (see below), whose sum is σ = 1067864821920. Its totient is φ = 105976531200.

The previous prime is 397440143483. The next prime is 397440143557. The reversal of 397440143550 is 55341044793.

397440143550 is a `hidden beast` number, since 3 + 97 + 4 + 4 + 0 + 1 + 4 + 3 + 550 = 666.

It is a super-3 number, since 3×397440143550³ (a number of 36 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 397440143496 and 397440143505.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9663931 + ... + 9704969.

It is an arithmetic number, because the mean of its divisors is an integer number (14831455860).

Almost surely, 2^397440143550 is an apocalyptic number.

397440143550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

397440143550 is an abundant number, since it is smaller than the sum of its proper divisors (670424678370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397440143550 is a wasteful number, since it uses less digits than its factorization.

397440143550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62578 (or 62570 counting only the distinct ones).

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

The spelling of 397440143550 in words is "three hundred ninety-seven billion, four hundred forty million, one hundred forty-three thousand, five hundred fifty".