243717420 has 24 divisors (see below), whose sum is σ = 682408944. Its totient is φ = 64991296.

The previous prime is 243717403. The next prime is 243717517. The reversal of 243717420 is 24717342.

243717420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×243717420² = 118796361622912800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 2030919 + ... + 2031038.

It is an arithmetic number, because the mean of its divisors is an integer number (28433706).

Almost surely, 2^243717420 is an apocalyptic number.

243717420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243717420 is an abundant number, since it is smaller than the sum of its proper divisors (438691524).

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

243717420 is a wasteful number, since it uses less digits than its factorization.

243717420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061969 (or 4061967 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 243717420 is about 15611.4515660780. The cubic root of 243717420 is about 624.6386561960.

The spelling of 243717420 in words is "two hundred forty-three million, seven hundred seventeen thousand, four hundred twenty".