402065890 has 8 divisors (see below), whose sum is σ = 723718620. Its totient is φ = 160826352.

The previous prime is 402065869. The next prime is 402065891. The reversal of 402065890 is 98560204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 400840441 + 1225449 = 20021^2 + 1107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (402065891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20103285 + ... + 20103304.

Almost surely, 2^402065890 is an apocalyptic number.

402065890 is a deficient number, since it is larger than the sum of its proper divisors (321652730).

402065890 is a wasteful number, since it uses less digits than its factorization.

402065890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40206596.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 402065890 is about 20051.5807356926. The cubic root of 402065890 is about 738.0725895163.

The spelling of 402065890 in words is "four hundred two million, sixty-five thousand, eight hundred ninety".