47420381 has 4 divisors (see below), whose sum is σ = 47476572. Its totient is φ = 47364192.

The previous prime is 47420377. The next prime is 47420383. The reversal of 47420381 is 18302474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18302474 = 2 ⋅9151237.

It can be written as a sum of positive squares in 2 ways, for example, as 27394756 + 20025625 = 5234^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 47420381 - 2² = 47420377 is a prime.

It is a super-2 number, since 2×47420381² = 4497385068370322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47420383) 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, 26810 + ... + 28523.

It is an arithmetic number, because the mean of its divisors is an integer number (11869143).

Almost surely, 2^47420381 is an apocalyptic number.

It is an amenable number.

47420381 is a deficient number, since it is larger than the sum of its proper divisors (56191).

47420381 is an equidigital number, since it uses as much as digits as its factorization.

47420381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56190.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 47420381 is about 6886.2457841701. The cubic root of 47420381 is about 361.9553606322.

The spelling of 47420381 in words is "forty-seven million, four hundred twenty thousand, three hundred eighty-one".