402668444 has 12 divisors (see below), whose sum is σ = 741757800. Its totient is φ = 190737648.

The previous prime is 402668423. The next prime is 402668449. The reversal of 402668444 is 444866204.

It is a super-2 number, since 2×402668444² = 324283751586762272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 402668398 and 402668407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402668449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2649059 + ... + 2649210.

It is an arithmetic number, because the mean of its divisors is an integer number (61813150).

Almost surely, 2^402668444 is an apocalyptic number.

It is an amenable number.

402668444 is a deficient number, since it is larger than the sum of its proper divisors (339089356).

402668444 is a wasteful number, since it uses less digits than its factorization.

402668444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298292 (or 5298290 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 38.

The square root of 402668444 is about 20066.6002102997. The cubic root of 402668444 is about 738.4411083947.

The spelling of 402668444 in words is "four hundred two million, six hundred sixty-eight thousand, four hundred forty-four".