42426640 has 20 divisors (see below), whose sum is σ = 98642124. Its totient is φ = 16970624.

The previous prime is 42426619. The next prime is 42426647. The reversal of 42426640 is 4662424.

It can be written as a sum of positive squares in 2 ways, for example, as 8133904 + 34292736 = 2852^2 + 5856^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 42426599 and 42426608.

It is not an unprimeable number, because it can be changed into a prime (42426647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265087 + ... + 265246.

Almost surely, 2^42426640 is an apocalyptic number.

42426640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42426640 is an abundant number, since it is smaller than the sum of its proper divisors (56215484).

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

42426640 is a wasteful number, since it uses less digits than its factorization.

42426640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530346 (or 530340 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 42426640 is about 6513.5735199658. The cubic root of 42426640 is about 348.7756951473.

The spelling of 42426640 in words is "forty-two million, four hundred twenty-six thousand, six hundred forty".