409398621 has 4 divisors (see below), whose sum is σ = 545864832. Its totient is φ = 272932412.

The previous prime is 409398589. The next prime is 409398629. The reversal of 409398621 is 126893904.

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 409398621 - 2⁵ = 409398589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409398629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68233101 + ... + 68233106.

It is an arithmetic number, because the mean of its divisors is an integer number (136466208).

Almost surely, 2^409398621 is an apocalyptic number.

It is an amenable number.

409398621 is a deficient number, since it is larger than the sum of its proper divisors (136466211).

409398621 is a wasteful number, since it uses less digits than its factorization.

409398621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136466210.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 409398621 is about 20233.6012859797. The cubic root of 409398621 is about 742.5324852864.

The spelling of 409398621 in words is "four hundred nine million, three hundred ninety-eight thousand, six hundred twenty-one".