16623404 has 24 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 6749136.

The previous prime is 16623403. The next prime is 16623407. The reversal of 16623404 is 40432661.

16623404 = T₄₃₂ + T₄₃₃ + ... + T₅₆₄.

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 7 ways as a sum of consecutive naturals, for example, 15092 + ... + 16155.

It is an arithmetic number, because the mean of its divisors is an integer number (1458240).

Almost surely, 2^16623404 is an apocalyptic number.

16623404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16623404 is an abundant number, since it is smaller than the sum of its proper divisors (18374356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16623404 is a wasteful number, since it uses less digits than its factorization.

16623404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31277 (or 31275 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 16623404 is about 4077.1808888005. The cubic root of 16623404 is about 255.2152686888.

The spelling of 16623404 in words is "sixteen million, six hundred twenty-three thousand, four hundred four".