42731940 has 24 divisors (see below), whose sum is σ = 119649600. Its totient is φ = 11395168.

The previous prime is 42731933. The next prime is 42731971. The reversal of 42731940 is 4913724.

It is a happy number.

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 = 42731898 and 42731907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356040 + ... + 356159.

It is an arithmetic number, because the mean of its divisors is an integer number (4985400).

Almost surely, 2^42731940 is an apocalyptic number.

It is an amenable number.

42731940 is an abundant number, since it is smaller than the sum of its proper divisors (76917660).

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

42731940 is a wasteful number, since it uses less digits than its factorization.

42731940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712211 (or 712209 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 42731940 is about 6536.9671867006. The cubic root of 42731940 is about 349.6102873181.

The spelling of 42731940 in words is "forty-two million, seven hundred thirty-one thousand, nine hundred forty".