40423040 has 96 divisors (see below), whose sum is σ = 112500900. Its totient is φ = 13848576.

The previous prime is 40423001. The next prime is 40423057. The reversal of 40423040 is 4032404.

It can be written as a sum of positive squares in 2 ways, for example, as 40043584 + 379456 = 6328^2 + 616^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30716 + ... + 32004.

Almost surely, 2^40423040 is an apocalyptic number.

40423040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40423040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56250450).

40423040 is an abundant number, since it is smaller than the sum of its proper divisors (72077860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40423040 is a wasteful number, since it uses less digits than its factorization.

40423040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1303 counting only the distinct ones).

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

The square root of 40423040 is about 6357.9116068093. The cubic root of 40423040 is about 343.1966108666.

Adding to 40423040 its reverse (4032404), we get a palindrome (44455444).

The spelling of 40423040 in words is "forty million, four hundred twenty-three thousand, forty".