42400915 has 4 divisors (see below), whose sum is σ = 50881104. Its totient is φ = 33920728.

The previous prime is 42400903. The next prime is 42400921. The reversal of 42400915 is 51900424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42400915 - 2⁹ = 42400403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42400915.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240087 + ... + 4240096.

It is an arithmetic number, because the mean of its divisors is an integer number (12720276).

Almost surely, 2^42400915 is an apocalyptic number.

42400915 is a deficient number, since it is larger than the sum of its proper divisors (8480189).

42400915 is an equidigital number, since it uses as much as digits as its factorization.

42400915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480188.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42400915 is about 6511.5984980648. The cubic root of 42400915 is about 348.7051885915.

The spelling of 42400915 in words is "forty-two million, four hundred thousand, nine hundred fifteen".