40415251 has 4 divisors (see below), whose sum is σ = 40815504. Its totient is φ = 40015000.

The previous prime is 40415237. The next prime is 40415269. The reversal of 40415251 is 15251404.

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

It is a cyclic number.

It is not a de Polignac number, because 40415251 - 2⁹ = 40414739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40415201) 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, 199975 + ... + 200176.

It is an arithmetic number, because the mean of its divisors is an integer number (10203876).

Almost surely, 2^40415251 is an apocalyptic number.

40415251 is a deficient number, since it is larger than the sum of its proper divisors (400253).

40415251 is a wasteful number, since it uses less digits than its factorization.

40415251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400252.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 40415251 is about 6357.2990333946. The cubic root of 40415251 is about 343.1745662594.

Adding to 40415251 its reverse (15251404), we get a palindrome (55666655).

The spelling of 40415251 in words is "forty million, four hundred fifteen thousand, two hundred fifty-one".