40407551 has 4 divisors (see below), whose sum is σ = 40425000. Its totient is φ = 40390104.

The previous prime is 40407533. The next prime is 40407553. The reversal of 40407551 is 15570404.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40407551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40407551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40407553) 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, 4601 + ... + 10098.

It is an arithmetic number, because the mean of its divisors is an integer number (10106250).

Almost surely, 2^40407551 is an apocalyptic number.

40407551 is a deficient number, since it is larger than the sum of its proper divisors (17449).

40407551 is a wasteful number, since it uses less digits than its factorization.

40407551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17448.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 40407551 is about 6356.6934014470. The cubic root of 40407551 is about 343.1527707579.

Adding to 40407551 its reverse (15570404), we get a palindrome (55977955).

The spelling of 40407551 in words is "forty million, four hundred seven thousand, five hundred fifty-one".