216477403 has 4 divisors (see below), whose sum is σ = 225889488. Its totient is φ = 207065320.

The previous prime is 216477389. The next prime is 216477407. The reversal of 216477403 is 304774612.

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

It is a de Polignac number, because none of the positive numbers 2^k-216477403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216477407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4706008 + ... + 4706053.

It is an arithmetic number, because the mean of its divisors is an integer number (56472372).

Almost surely, 2^216477403 is an apocalyptic number.

216477403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

216477403 is a deficient number, since it is larger than the sum of its proper divisors (9412085).

216477403 is an equidigital number, since it uses as much as digits as its factorization.

216477403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9412084.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 216477403 is about 14713.1710722060. The cubic root of 216477403 is about 600.4417145488.

The spelling of 216477403 in words is "two hundred sixteen million, four hundred seventy-seven thousand, four hundred three".