47997445 has 4 divisors (see below), whose sum is σ = 57596940. Its totient is φ = 38397952.

The previous prime is 47997437. The next prime is 47997449. The reversal of 47997445 is 54479974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54479974 = 2 ⋅27239987.

It can be written as a sum of positive squares in 2 ways, for example, as 11985444 + 36012001 = 3462^2 + 6001^2 .

It is a cyclic number.

It is not a de Polignac number, because 47997445 - 2³ = 47997437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47997449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4799740 + ... + 4799749.

It is an arithmetic number, because the mean of its divisors is an integer number (14399235).

Almost surely, 2^47997445 is an apocalyptic number.

It is an amenable number.

47997445 is a deficient number, since it is larger than the sum of its proper divisors (9599495).

47997445 is an equidigital number, since it uses as much as digits as its factorization.

47997445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599494.

The product of its digits is 1270080, while the sum is 49.

The square root of 47997445 is about 6928.0188365795. The cubic root of 47997445 is about 363.4176701977.

The spelling of 47997445 in words is "forty-seven million, nine hundred ninety-seven thousand, four hundred forty-five".