47388421 has 4 divisors (see below), whose sum is σ = 47672352. Its totient is φ = 47104492.

The previous prime is 47388403. The next prime is 47388427. The reversal of 47388421 is 12488374.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12488374 = 2 ⋅6244187.

It is a cyclic number.

It is not a de Polignac number, because 47388421 - 2¹⁵ = 47355653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47388427) 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, 141715 + ... + 142048.

It is an arithmetic number, because the mean of its divisors is an integer number (11918088).

Almost surely, 2^47388421 is an apocalyptic number.

It is an amenable number.

47388421 is a deficient number, since it is larger than the sum of its proper divisors (283931).

47388421 is a wasteful number, since it uses less digits than its factorization.

47388421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283930.

The product of its digits is 43008, while the sum is 37.

The square root of 47388421 is about 6883.9248252723. The cubic root of 47388421 is about 361.8740264540.

The spelling of 47388421 in words is "forty-seven million, three hundred eighty-eight thousand, four hundred twenty-one".