40020434 has 4 divisors (see below), whose sum is σ = 60030654. Its totient is φ = 20010216.

The previous prime is 40020433. The next prime is 40020443. The reversal of 40020434 is 43402004.

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

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 644809 = 6275^2 + 803^2 .

It is not an unprimeable number, because it can be changed into a prime (40020433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005107 + ... + 10005110.

Almost surely, 2^40020434 is an apocalyptic number.

40020434 is a deficient number, since it is larger than the sum of its proper divisors (20010220).

40020434 is a wasteful number, since it uses less digits than its factorization.

40020434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20010219.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40020434 is about 6326.1705636190. The cubic root of 40020434 is about 342.0534155023.

Adding to 40020434 its reverse (43402004), we get a palindrome (83422438).

The spelling of 40020434 in words is "forty million, twenty thousand, four hundred thirty-four".