42122399 has 12 divisors (see below), whose sum is σ = 46459560. Its totient is φ = 38161200.

The previous prime is 42122393. The next prime is 42122429. The reversal of 42122399 is 99322124.

It is a de Polignac number, because none of the positive numbers 2^k-42122399 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42122393) 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, 59057 + ... + 59765.

It is an arithmetic number, because the mean of its divisors is an integer number (3871630).

Almost surely, 2^42122399 is an apocalyptic number.

42122399 is a deficient number, since it is larger than the sum of its proper divisors (4337161).

42122399 is a wasteful number, since it uses less digits than its factorization.

42122399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 1211 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 42122399 is about 6490.1771162273. The cubic root of 42122399 is about 347.9400054017.

Adding to 42122399 its sum of digits (32), we get a triangular number (42122431 = T₉₁₇₈).

The spelling of 42122399 in words is "forty-two million, one hundred twenty-two thousand, three hundred ninety-nine".