42779415 has 32 divisors (see below), whose sum is σ = 78667776. Its totient is φ = 19445760.

The previous prime is 42779413. The next prime is 42779423. The reversal of 42779415 is 51497724.

It is not a de Polignac number, because 42779415 - 2¹ = 42779413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42779413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19210 + ... + 21320.

It is an arithmetic number, because the mean of its divisors is an integer number (2458368).

Almost surely, 2^42779415 is an apocalyptic number.

42779415 is a deficient number, since it is larger than the sum of its proper divisors (35888361).

42779415 is a wasteful number, since it uses less digits than its factorization.

42779415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its digits is 70560, while the sum is 39.

The square root of 42779415 is about 6540.5974497748. The cubic root of 42779415 is about 349.7397112378.

The spelling of 42779415 in words is "forty-two million, seven hundred seventy-nine thousand, four hundred fifteen".