42390429 has 4 divisors (see below), whose sum is σ = 56520576. Its totient is φ = 28260284.

The previous prime is 42390391. The next prime is 42390437. The reversal of 42390429 is 92409324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42390429 - 2⁹ = 42389917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42390429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42390629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7065069 + ... + 7065074.

It is an arithmetic number, because the mean of its divisors is an integer number (14130144).

Almost surely, 2^42390429 is an apocalyptic number.

It is an amenable number.

42390429 is a deficient number, since it is larger than the sum of its proper divisors (14130147).

42390429 is a wasteful number, since it uses less digits than its factorization.

42390429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14130146.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 42390429 is about 6510.7932696408. The cubic root of 42390429 is about 348.6764405950.

The spelling of 42390429 in words is "forty-two million, three hundred ninety thousand, four hundred twenty-nine".