421280165 has 8 divisors (see below), whose sum is σ = 511216920. Its totient is φ = 333236992.

The previous prime is 421280147. The next prime is 421280177. The reversal of 421280165 is 561082124.

It can be written as a sum of positive squares in 4 ways, for example, as 52678564 + 368601601 = 7258^2 + 19199^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 421280165 - 2¹⁴ = 421263781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472904 + ... + 473793.

It is an arithmetic number, because the mean of its divisors is an integer number (63902115).

Almost surely, 2^421280165 is an apocalyptic number.

It is an amenable number.

421280165 is a deficient number, since it is larger than the sum of its proper divisors (89936755).

421280165 is an equidigital number, since it uses as much as digits as its factorization.

421280165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946791.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 421280165 is about 20525.1105965352. The cubic root of 421280165 is about 749.6473393852.

The spelling of 421280165 in words is "four hundred twenty-one million, two hundred eighty thousand, one hundred sixty-five".