47989440 has 168 divisors, whose sum is σ = 173949360. Its totient is φ = 12109824.

The previous prime is 47989439. The next prime is 47989441. The reversal of 47989440 is 4498974.

It is an interprime number because it is at equal distance from previous prime (47989439) and next prime (47989441).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (47989441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54282 + ... + 55158.

Almost surely, 2^47989440 is an apocalyptic number.

47989440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86974680).

47989440 is an abundant number, since it is smaller than the sum of its proper divisors (125959920).

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

47989440 is a wasteful number, since it uses less digits than its factorization.

47989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 47989440 is about 6927.4410859999. The cubic root of 47989440 is about 363.3974655097.

The spelling of 47989440 in words is "forty-seven million, nine hundred eighty-nine thousand, four hundred forty".