8421377 has 4 divisors (see below), whose sum is σ = 8430000. Its totient is φ = 8412756.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421377 is 7731248.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8421377 - 2¹⁴ = 8404993 is a prime.

It is a super-2 number, since 2×8421377² = 141839181152258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2627 + ... + 4872.

It is an arithmetic number, because the mean of its divisors is an integer number (2107500).

It is a Proth number, since it is equal to 257 ⋅ 2¹⁵ + 1 and 257 < 2¹⁵.

Almost surely, 2^8421377 is an apocalyptic number.

It is an amenable number.

8421377 is a deficient number, since it is larger than the sum of its proper divisors (8623).

8421377 is a wasteful number, since it uses less digits than its factorization.

8421377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8622.

The product of its digits is 9408, while the sum is 32.

The square root of 8421377 is about 2901.9608887785. The cubic root of 8421377 is about 203.4515658045.

The spelling of 8421377 in words is "eight million, four hundred twenty-one thousand, three hundred seventy-seven".