216425940 has 24 divisors (see below), whose sum is σ = 605992800. Its totient is φ = 57713568.

The previous prime is 216425899. The next prime is 216425971. The reversal of 216425940 is 49524612.

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, 1803490 + ... + 1803609.

It is an arithmetic number, because the mean of its divisors is an integer number (25249700).

Almost surely, 2^216425940 is an apocalyptic number.

216425940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216425940 is an abundant number, since it is smaller than the sum of its proper divisors (389566860).

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

216425940 is a wasteful number, since it uses less digits than its factorization.

216425940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607111 (or 3607109 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 216425940 is about 14711.4220930541. The cubic root of 216425940 is about 600.3941299349.

The spelling of 216425940 in words is "two hundred sixteen million, four hundred twenty-five thousand, nine hundred forty".