40345040 has 40 divisors (see below), whose sum is σ = 95136768. Its totient is φ = 15908480.

The previous prime is 40345021. The next prime is 40345057. The reversal of 40345040 is 4054304.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129 + ... + 9231.

Almost surely, 2^40345040 is an apocalyptic number.

40345040 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 40345040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47568384).

40345040 is an abundant number, since it is smaller than the sum of its proper divisors (54791728).

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

40345040 is a wasteful number, since it uses less digits than its factorization.

40345040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187 (or 7181 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 40345040 is about 6351.7745551932. The cubic root of 40345040 is about 342.9757255159.

Adding to 40345040 its reverse (4054304), we get a palindrome (44399344).

The spelling of 40345040 in words is "forty million, three hundred forty-five thousand, forty".