42747440 has 40 divisors (see below), whose sum is σ = 101511360. Its totient is φ = 16733696.

The previous prime is 42747437. The next prime is 42747449. The reversal of 42747440 is 4474724.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 42747397 and 42747406.

It is not an unprimeable number, because it can be changed into a prime (42747449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1925 + ... + 9444.

It is an arithmetic number, because the mean of its divisors is an integer number (2537784).

Almost surely, 2^42747440 is an apocalyptic number.

42747440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42747440 is an abundant number, since it is smaller than the sum of its proper divisors (58763920).

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

42747440 is a wasteful number, since it uses less digits than its factorization.

42747440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11429 (or 11423 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 32.

The square root of 42747440 is about 6538.1526442872. The cubic root of 42747440 is about 349.6525531610.

The spelling of 42747440 in words is "forty-two million, seven hundred forty-seven thousand, four hundred forty".