42420739 has 4 divisors (see below), whose sum is σ = 42487560. Its totient is φ = 42353920.

The previous prime is 42420733. The next prime is 42420751. The reversal of 42420739 is 93702424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42420739 is a prime.

It is a super-2 number, since 2×42420739² = 3599038194612242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42420739.

It is not an unprimeable number, because it can be changed into a prime (42420733) 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, 32449 + ... + 33730.

It is an arithmetic number, because the mean of its divisors is an integer number (10621890).

Almost surely, 2^42420739 is an apocalyptic number.

42420739 is a deficient number, since it is larger than the sum of its proper divisors (66821).

42420739 is an equidigital number, since it uses as much as digits as its factorization.

42420739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66820.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42420739 is about 6513.1205270592. The cubic root of 42420739 is about 348.7595243263.

The spelling of 42420739 in words is "forty-two million, four hundred twenty thousand, seven hundred thirty-nine".