399881653 has 2 divisors, whose sum is σ = 399881654. Its totient is φ = 399881652.

The previous prime is 399881621. The next prime is 399881683. The reversal of 399881653 is 356188993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399720049 + 161604 = 19993^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 399881653 - 2⁵ = 399881621 is a prime.

It is a super-4 number, since 4×399881653⁴ (a number of 36 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399881653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399881683) 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 as a sum of consecutive naturals, namely, 199940826 + 199940827.

It is an arithmetic number, because the mean of its divisors is an integer number (199940827).

Almost surely, 2^399881653 is an apocalyptic number.

It is an amenable number.

399881653 is a deficient number, since it is larger than the sum of its proper divisors (1).

399881653 is an equidigital number, since it uses as much as digits as its factorization.

399881653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 399881653 is about 19997.0411061237. The cubic root of 399881653 is about 736.7336268811.

The spelling of 399881653 in words is "three hundred ninety-nine million, eight hundred eighty-one thousand, six hundred fifty-three".