169038421 has 4 divisors (see below), whose sum is σ = 177935200. Its totient is φ = 160141644.

The previous prime is 169038407. The next prime is 169038451. The reversal of 169038421 is 124830961.

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 169038421 - 2⁹ = 169037909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169038451) 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, 4448361 + ... + 4448398.

It is an arithmetic number, because the mean of its divisors is an integer number (44483800).

Almost surely, 2^169038421 is an apocalyptic number.

It is an amenable number.

169038421 is a deficient number, since it is larger than the sum of its proper divisors (8896779).

169038421 is an equidigital number, since it uses as much as digits as its factorization.

169038421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8896778.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 169038421 is about 13001.4776467908. The cubic root of 169038421 is about 552.9193758376.

The spelling of 169038421 in words is "one hundred sixty-nine million, thirty-eight thousand, four hundred twenty-one".