16405433 has 4 divisors (see below), whose sum is σ = 17896848. Its totient is φ = 14914020.

The previous prime is 16405429. The next prime is 16405439. The reversal of 16405433 is 33450461.

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 not a de Polignac number, because 16405433 - 2² = 16405429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16405439) 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, 745691 + ... + 745712.

It is an arithmetic number, because the mean of its divisors is an integer number (4474212).

Almost surely, 2^16405433 is an apocalyptic number.

It is an amenable number.

16405433 is a deficient number, since it is larger than the sum of its proper divisors (1491415).

16405433 is a wasteful number, since it uses less digits than its factorization.

16405433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491414.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 16405433 is about 4050.3620825798. The cubic root of 16405433 is about 254.0948712501.

Adding to 16405433 its reverse (33450461), we get a palindrome (49855894).

The spelling of 16405433 in words is "sixteen million, four hundred five thousand, four hundred thirty-three".