216435440 has 40 divisors (see below), whose sum is σ = 541923648. Its totient is φ = 79914240.

The previous prime is 216435419. The next prime is 216435467. The reversal of 216435440 is 44534612.

216435440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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, 103016 + ... + 105095.

Almost surely, 2^216435440 is an apocalyptic number.

216435440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216435440 is an abundant number, since it is smaller than the sum of its proper divisors (325488208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216435440 is a wasteful number, since it uses less digits than its factorization.

216435440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208137 (or 208131 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 216435440 is about 14711.7449678820. The cubic root of 216435440 is about 600.4029145577.

The spelling of 216435440 in words is "two hundred sixteen million, four hundred thirty-five thousand, four hundred forty".