406624765 has 4 divisors (see below), whose sum is σ = 487949724. Its totient is φ = 325299808.

The previous prime is 406624753. The next prime is 406624781. The reversal of 406624765 is 567426604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226984356 + 179640409 = 15066^2 + 13403^2 .

It is a cyclic number.

It is not a de Polignac number, because 406624765 - 2¹⁷ = 406493693 is a prime.

It is a super-2 number, since 2×406624765² = 330687399022610450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 40662472 + ... + 40662481.

It is an arithmetic number, because the mean of its divisors is an integer number (121987431).

Almost surely, 2^406624765 is an apocalyptic number.

It is an amenable number.

406624765 is a deficient number, since it is larger than the sum of its proper divisors (81324959).

406624765 is an equidigital number, since it uses as much as digits as its factorization.

406624765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81324958.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 406624765 is about 20164.9390031312. The cubic root of 406624765 is about 740.8516886128.

The spelling of 406624765 in words is "four hundred six million, six hundred twenty-four thousand, seven hundred sixty-five".