405720023 has 8 divisors (see below), whose sum is σ = 423910368. Its totient is φ = 387575584.

The previous prime is 405720017. The next prime is 405720031. The reversal of 405720023 is 320027504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405720023 - 2²⁶ = 338611159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405720013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7265 + ... + 29397.

It is an arithmetic number, because the mean of its divisors is an integer number (52988796).

Almost surely, 2^405720023 is an apocalyptic number.

405720023 is a deficient number, since it is larger than the sum of its proper divisors (18190345).

405720023 is a wasteful number, since it uses less digits than its factorization.

405720023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22953.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 405720023 is about 20142.4929688457. The cubic root of 405720023 is about 740.3018144317.

Adding to 405720023 its reverse (320027504), we get a palindrome (725747527).

It can be divided in two parts, 4057200 and 23, that multiplied together give a square (93315600 = 9660²).

The spelling of 405720023 in words is "four hundred five million, seven hundred twenty thousand, twenty-three".