8380421 has 6 divisors (see below), whose sum is σ = 9748710. Its totient is φ = 7183176.

The previous prime is 8380417. The next prime is 8380451. The reversal of 8380421 is 1240838.

It can be written as a sum of positive squares in only one way, i.e., 6964321 + 1416100 = 2639^2 + 1190^2 .

It is not a de Polignac number, because 8380421 - 2² = 8380417 is a prime.

It is a super-2 number, since 2×8380421² = 140462912274482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8380451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85466 + ... + 85563.

It is an arithmetic number, because the mean of its divisors is an integer number (1624785).

Almost surely, 2^8380421 is an apocalyptic number.

It is an amenable number.

8380421 is a deficient number, since it is larger than the sum of its proper divisors (1368289).

8380421 is a wasteful number, since it uses less digits than its factorization.

8380421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171043 (or 171036 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 8380421 is about 2894.8956803312. The cubic root of 8380421 is about 203.1212117952.

The spelling of 8380421 in words is "eight million, three hundred eighty thousand, four hundred twenty-one".