42440415 has 32 divisors (see below), whose sum is σ = 72446400. Its totient is φ = 21141504.

The previous prime is 42440401. The next prime is 42440423. The reversal of 42440415 is 51404424.

It is a happy number.

It is not a de Polignac number, because 42440415 - 2⁶ = 42440351 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37437 + ... + 38553.

It is an arithmetic number, because the mean of its divisors is an integer number (2263950).

Almost surely, 2^42440415 is an apocalyptic number.

42440415 is a deficient number, since it is larger than the sum of its proper divisors (30005985).

42440415 is a wasteful number, since it uses less digits than its factorization.

42440415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 42440415 is about 6514.6308414215. The cubic root of 42440415 is about 348.8134376706.

Adding to 42440415 its reverse (51404424), we get a palindrome (93844839).

The spelling of 42440415 in words is "forty-two million, four hundred forty thousand, four hundred fifteen".