47218747 has 4 divisors (see below), whose sum is σ = 49271760. Its totient is φ = 45165736.

The previous prime is 47218739. The next prime is 47218753. The reversal of 47218747 is 74781274.

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

It is a cyclic number.

It is not a de Polignac number, because 47218747 - 2³ = 47218739 is a prime.

It is a super-2 number, since 2×47218747² = 4459220136500018, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47210747) 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, 1026472 + ... + 1026517.

It is an arithmetic number, because the mean of its divisors is an integer number (12317940).

Almost surely, 2^47218747 is an apocalyptic number.

47218747 is a deficient number, since it is larger than the sum of its proper divisors (2053013).

47218747 is a wasteful number, since it uses less digits than its factorization.

47218747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053012.

The product of its digits is 87808, while the sum is 40.

The square root of 47218747 is about 6871.5898451523. The cubic root of 47218747 is about 361.4416139229.

The spelling of 47218747 in words is "forty-seven million, two hundred eighteen thousand, seven hundred forty-seven".