42047940 has 48 divisors (see below), whose sum is σ = 128439360. Its totient is φ = 10193280.

The previous prime is 42047911. The next prime is 42047959. The reversal of 42047940 is 4974024.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42047898 and 42047907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31195 + ... + 32514.

It is an arithmetic number, because the mean of its divisors is an integer number (2675820).

Almost surely, 2^42047940 is an apocalyptic number.

It is an amenable number.

42047940 is an abundant number, since it is smaller than the sum of its proper divisors (86391420).

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

42047940 is a wasteful number, since it uses less digits than its factorization.

42047940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63732 (or 63730 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 42047940 is about 6484.4382948718. The cubic root of 42047940 is about 347.7348687384.

The spelling of 42047940 in words is "forty-two million, forty-seven thousand, nine hundred forty".