8421490 has 32 divisors (see below), whose sum is σ = 18900864. Its totient is φ = 2624640.

The previous prime is 8421487. The next prime is 8421493. The reversal of 8421490 is 941248.

It is an interprime number because it is at equal distance from previous prime (8421487) and next prime (8421493).

It is a d-powerful number, because it can be written as 8⁵ + 4² + 2²³ + 1 + 4² + 9² + 0 .

It is not an unprimeable number, because it can be changed into a prime (8421493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4699 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (590652).

Almost surely, 2^8421490 is an apocalyptic number.

8421490 is an abundant number, since it is smaller than the sum of its proper divisors (10479374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421490 is a wasteful number, since it uses less digits than its factorization.

8421490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8421490 is about 2901.9803583071. The cubic root of 8421490 is about 203.4524757873.

It can be divided in two parts, 8421 and 490, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 8421490 in words is "eight million, four hundred twenty-one thousand, four hundred ninety".