406516645 has 8 divisors (see below), whose sum is σ = 487929240. Its totient is φ = 325140480.

The previous prime is 406516637. The next prime is 406516727. The reversal of 406516645 is 546615604.

It can be written as a sum of positive squares in 4 ways, for example, as 332929 + 406183716 = 577^2 + 20154^2 .

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

It is not a de Polignac number, because 406516645 - 2³ = 406516637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34021 + ... + 44389.

It is an arithmetic number, because the mean of its divisors is an integer number (60991155).

Almost surely, 2^406516645 is an apocalyptic number.

It is an amenable number.

406516645 is a deficient number, since it is larger than the sum of its proper divisors (81412595).

406516645 is a wasteful number, since it uses less digits than its factorization.

406516645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18215.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 406516645 is about 20162.2579340708. The cubic root of 406516645 is about 740.7860195635.

The spelling of 406516645 in words is "four hundred six million, five hundred sixteen thousand, six hundred forty-five".