23404545 has 28 divisors (see below), whose sum is σ = 42115476. Its totient is φ = 12480480.

The previous prime is 23404517. The next prime is 23404571. The reversal of 23404545 is 54540432.

It can be written as a sum of positive squares in 2 ways, for example, as 7436529 + 15968016 = 2727^2 + 3996^2 .

It is not a de Polignac number, because 23404545 - 2⁷ = 23404417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

23404545 is a modest number, since divided by 4545 gives 2340 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 435 + ... + 6855.

It is a Proth number, since it is equal to 2857 ⋅ 2¹³ + 1 and 2857 < 2¹³.

Almost surely, 2^23404545 is an apocalyptic number.

It is an amenable number.

23404545 is a deficient number, since it is larger than the sum of its proper divisors (18710931).

23404545 is an frugal number, since it uses more digits than its factorization.

23404545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444 (or 6429 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 23404545 is about 4837.8244077271. The cubic root of 23404545 is about 286.0443677398.

Adding to 23404545 its reverse (54540432), we get a palindrome (77944977).

The spelling of 23404545 in words is "twenty-three million, four hundred four thousand, five hundred forty-five".