421673537 has 4 divisors (see below), whose sum is σ = 422625840. Its totient is φ = 420721236.

The previous prime is 421673509. The next prime is 421673557. The reversal of 421673537 is 735376124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421673537 - 2⁸ = 421673281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421673537.

It is not an unprimeable number, because it can be changed into a prime (421673507) 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, 475487 + ... + 476372.

It is an arithmetic number, because the mean of its divisors is an integer number (105656460).

Almost surely, 2^421673537 is an apocalyptic number.

It is an amenable number.

421673537 is a deficient number, since it is larger than the sum of its proper divisors (952303).

421673537 is an equidigital number, since it uses as much as digits as its factorization.

421673537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952302.

The product of its digits is 105840, while the sum is 38.

The square root of 421673537 is about 20534.6910617131. The cubic root of 421673537 is about 749.8805955096.

The spelling of 421673537 in words is "four hundred twenty-one million, six hundred seventy-three thousand, five hundred thirty-seven".