40451540 has 48 divisors (see below), whose sum is σ = 87744384. Its totient is φ = 15657600.

The previous prime is 40451539. The next prime is 40451557. The reversal of 40451540 is 4515404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86387 + ... + 86853.

It is an arithmetic number, because the mean of its divisors is an integer number (1828008).

Almost surely, 2^40451540 is an apocalyptic number.

It is an amenable number.

40451540 is an abundant number, since it is smaller than the sum of its proper divisors (47292844).

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

40451540 is a wasteful number, since it uses less digits than its factorization.

40451540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 40451540 is about 6360.1525138946. The cubic root of 40451540 is about 343.2772480941.

Adding to 40451540 its reverse (4515404), we get a palindrome (44966944).

The spelling of 40451540 in words is "forty million, four hundred fifty-one thousand, five hundred forty".