399867402281 has 4 divisors (see below), whose sum is σ = 401013154500. Its totient is φ = 398721650064.

The previous prime is 399867402217. The next prime is 399867402289. The reversal of 399867402281 is 182204768993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182204768993 = 13 ⋅14015751461.

It can be written as a sum of positive squares in 2 ways, for example, as 287987856025 + 111879546256 = 536645^2 + 334484^2 .

It is a cyclic number.

It is not a de Polignac number, because 399867402281 - 2⁶ = 399867402217 is a prime.

It is a super-2 number, since 2×399867402281² (a number of 24 digits) contains 22 as substring.

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 399867402281.

It is not an unprimeable number, because it can be changed into a prime (399867402289) 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 3 ways as a sum of consecutive naturals, for example, 572875586 + ... + 572876283.

It is an arithmetic number, because the mean of its divisors is an integer number (100253288625).

Almost surely, 2^399867402281 is an apocalyptic number.

It is an amenable number.

399867402281 is a deficient number, since it is larger than the sum of its proper divisors (1145752219).

399867402281 is a wasteful number, since it uses less digits than its factorization.

399867402281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145752218.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 399867402281 in words is "three hundred ninety-nine billion, eight hundred sixty-seven million, four hundred two thousand, two hundred eighty-one".