40126789 has 4 divisors (see below), whose sum is σ = 41871456. Its totient is φ = 38382124.

The previous prime is 40126787. The next prime is 40126813. The reversal of 40126789 is 98762104.

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 not a de Polignac number, because 40126789 - 2¹ = 40126787 is a prime.

It is a super-2 number, since 2×40126789² = 3220318390901042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40126781) 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, 872299 + ... + 872344.

It is an arithmetic number, because the mean of its divisors is an integer number (10467864).

Almost surely, 2^40126789 is an apocalyptic number.

It is an amenable number.

40126789 is a deficient number, since it is larger than the sum of its proper divisors (1744667).

40126789 is a wasteful number, since it uses less digits than its factorization.

40126789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744666.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 40126789 is about 6334.5709404821. The cubic root of 40126789 is about 342.3561517868.

It can be divided in two parts, 4012 and 6789, that added together give a palindrome (10801).

The spelling of 40126789 in words is "forty million, one hundred twenty-six thousand, seven hundred eighty-nine".