405606745 has 8 divisors (see below), whose sum is σ = 498047616. Its totient is φ = 316939056.

The previous prime is 405606739. The next prime is 405606749. The reversal of 405606745 is 547606504.

It is a happy number.

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 405606745 - 2²⁵ = 372052313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405606749) 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, 943057 + ... + 943486.

It is an arithmetic number, because the mean of its divisors is an integer number (62255952).

Almost surely, 2^405606745 is an apocalyptic number.

It is an amenable number.

405606745 is a deficient number, since it is larger than the sum of its proper divisors (92440871).

405606745 is a wasteful number, since it uses less digits than its factorization.

405606745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886591.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 405606745 is about 20139.6808564585. The cubic root of 405606745 is about 740.2329100066.

It can be divided in two parts, 405606 and 745, that added together give a triangular number (406351 = T₉₀₁).

The spelling of 405606745 in words is "four hundred five million, six hundred six thousand, seven hundred forty-five".