42731340 has 48 divisors (see below), whose sum is σ = 121685760. Its totient is φ = 11200960.

The previous prime is 42731321. The next prime is 42731341. The reversal of 42731340 is 4313724.

It is a self number, because there is not a number n which added to its sum of digits gives 42731340.

It is not an unprimeable number, because it can be changed into a prime (42731341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496 + ... + 9575.

It is an arithmetic number, because the mean of its divisors is an integer number (2535120).

Almost surely, 2^42731340 is an apocalyptic number.

It is an amenable number.

42731340 is an abundant number, since it is smaller than the sum of its proper divisors (78954420).

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

42731340 is a wasteful number, since it uses less digits than its factorization.

42731340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12142 (or 12140 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 42731340 is about 6536.9212936978. The cubic root of 42731340 is about 349.6086510155.

It can be divided in two parts, 42731 and 340, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42731340 in words is "forty-two million, seven hundred thirty-one thousand, three hundred forty".