16623405 has 12 divisors (see below), whose sum is σ = 28813980. Its totient is φ = 8865792.

The previous prime is 16623403. The next prime is 16623407. The reversal of 16623405 is 50432661.

It is an interprime number because it is at equal distance from previous prime (16623403) and next prime (16623407).

It can be written as a sum of positive squares in 2 ways, for example, as 10949481 + 5673924 = 3309^2 + 2382^2 .

It is not a de Polignac number, because 16623405 - 2¹ = 16623403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184660 + ... + 184749.

It is an arithmetic number, because the mean of its divisors is an integer number (2401165).

Almost surely, 2^16623405 is an apocalyptic number.

16623405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16623405 is a deficient number, since it is larger than the sum of its proper divisors (12190575).

16623405 is a wasteful number, since it uses less digits than its factorization.

16623405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369420 (or 369417 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 16623405 is about 4077.1810114342. The cubic root of 16623405 is about 255.2152738063.

The spelling of 16623405 in words is "sixteen million, six hundred twenty-three thousand, four hundred five".