42015620 has 12 divisors (see below), whose sum is σ = 88232844. Its totient is φ = 16806240.

The previous prime is 42015613. The next prime is 42015629. The reversal of 42015620 is 2651024.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18181696 + 23833924 = 4264^2 + 4882^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2100781 = 42015620 / (4 + 2 + 0 + 1 + 5 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 42015592 and 42015601.

It is not an unprimeable number, because it can be changed into a prime (42015629) 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, 1050371 + ... + 1050410.

It is an arithmetic number, because the mean of its divisors is an integer number (7352737).

Almost surely, 2^42015620 is an apocalyptic number.

It is an amenable number.

42015620 is an abundant number, since it is smaller than the sum of its proper divisors (46217224).

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

42015620 is a wasteful number, since it uses less digits than its factorization.

42015620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100790 (or 2100788 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42015620 is about 6481.9456955454. The cubic root of 42015620 is about 347.6457508431.

Adding to 42015620 its reverse (2651024), we get a palindrome (44666644).

The spelling of 42015620 in words is "forty-two million, fifteen thousand, six hundred twenty".