402638105 has 12 divisors (see below), whose sum is σ = 486095340. Its totient is φ = 320163072.

The previous prime is 402638087. The next prime is 402638113. The reversal of 402638105 is 501836204.

It can be written as a sum of positive squares in 6 ways, for example, as 36336784 + 366301321 = 6028^2 + 19139^2 .

It is not a de Polignac number, because 402638105 - 2⁸ = 402637849 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 678689 + ... + 679281.

It is an arithmetic number, because the mean of its divisors is an integer number (40507945).

Almost surely, 2^402638105 is an apocalyptic number.

It is an amenable number.

402638105 is a deficient number, since it is larger than the sum of its proper divisors (83457235).

402638105 is an frugal number, since it uses more digits than its factorization.

402638105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 402638105 is about 20065.8442384067. The cubic root of 402638105 is about 738.4225620134.

The spelling of 402638105 in words is "four hundred two million, six hundred thirty-eight thousand, one hundred five".