403680385 has 16 divisors (see below), whose sum is σ = 514767312. Its totient is φ = 302848000.

The previous prime is 403680379. The next prime is 403680443. The reversal of 403680385 is 583086304.

It can be written as a sum of positive squares in 8 ways, for example, as 110859841 + 292820544 = 10529^2 + 17112^2 .

It is not a de Polignac number, because 403680385 - 2⁵ = 403680353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15435 + ... + 32335.

It is an arithmetic number, because the mean of its divisors is an integer number (32172957).

Almost surely, 2^403680385 is an apocalyptic number.

It is an amenable number.

403680385 is a deficient number, since it is larger than the sum of its proper divisors (111086927).

403680385 is a wasteful number, since it uses less digits than its factorization.

403680385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 403680385 is about 20091.7989488249. The cubic root of 403680385 is about 739.0591799469.

The spelling of 403680385 in words is "four hundred three million, six hundred eighty thousand, three hundred eighty-five".