42097815 has 12 divisors (see below), whose sum is σ = 72969624. Its totient is φ = 22452144.

The previous prime is 42097813. The next prime is 42097819. The reversal of 42097815 is 51879024.

It is not a de Polignac number, because 42097815 - 2¹ = 42097813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42097815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42097813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467709 + ... + 467798.

It is an arithmetic number, because the mean of its divisors is an integer number (6080802).

Almost surely, 2^42097815 is an apocalyptic number.

42097815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42097815 is a deficient number, since it is larger than the sum of its proper divisors (30871809).

42097815 is a wasteful number, since it uses less digits than its factorization.

42097815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935518 (or 935515 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 42097815 is about 6488.2829007373. The cubic root of 42097815 is about 347.8723025332.

The spelling of 42097815 in words is "forty-two million, ninety-seven thousand, eight hundred fifteen".