40420439 has 4 divisors (see below), whose sum is σ = 40778256. Its totient is φ = 40062624.

The previous prime is 40420433. The next prime is 40420451. The reversal of 40420439 is 93402404.

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

It is a cyclic number.

It is not a de Polignac number, because 40420439 - 2²⁰ = 39371863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420433) 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, 178739 + ... + 178964.

It is an arithmetic number, because the mean of its divisors is an integer number (10194564).

Almost surely, 2^40420439 is an apocalyptic number.

40420439 is a deficient number, since it is larger than the sum of its proper divisors (357817).

40420439 is a wasteful number, since it uses less digits than its factorization.

40420439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357816.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 40420439 is about 6357.7070552205. The cubic root of 40420439 is about 343.1892497715.

The spelling of 40420439 in words is "forty million, four hundred twenty thousand, four hundred thirty-nine".