42399279 has 24 divisors (see below), whose sum is σ = 69429360. Its totient is φ = 24717312.

The previous prime is 42399277. The next prime is 42399307. The reversal of 42399279 is 97299324.

42399279 = T₁₄₂ + T₁₄₃ + ... + T₆₃₅.

It is not a de Polignac number, because 42399279 - 2¹ = 42399277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42399277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7314 + ... + 11759.

It is an arithmetic number, because the mean of its divisors is an integer number (2892890).

Almost surely, 2^42399279 is an apocalyptic number.

42399279 is a deficient number, since it is larger than the sum of its proper divisors (27030081).

42399279 is a wasteful number, since it uses less digits than its factorization.

42399279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19111 (or 19108 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 42399279 is about 6511.4728748571. The cubic root of 42399279 is about 348.7007037117.

Adding to 42399279 its sum of digits (45), we get a palindrome (42399324).

The spelling of 42399279 in words is "forty-two million, three hundred ninety-nine thousand, two hundred seventy-nine".