1009421 has 4 divisors (see below), whose sum is σ = 1153632. Its totient is φ = 865212.

The previous prime is 1009417. The next prime is 1009433. The reversal of 1009421 is 1249001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1009421 - 2² = 1009417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1009421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72095 + ... + 72108.

It is an arithmetic number, because the mean of its divisors is an integer number (288408).

2^1009421 is an apocalyptic number.

It is an amenable number.

1009421 is a deficient number, since it is larger than the sum of its proper divisors (144211).

1009421 is an equidigital number, since it uses as much as digits as its factorization.

1009421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144210.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1009421 is about 1004.6994575494. The cubic root of 1009421 is about 100.3130522933.

The spelling of 1009421 in words is "one million, nine thousand, four hundred twenty-one".