40624891 has 4 divisors (see below), whose sum is σ = 41615784. Its totient is φ = 39634000.

The previous prime is 40624879. The next prime is 40624897. The reversal of 40624891 is 19842604.

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 40624891 - 2¹⁷ = 40493819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40624897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495385 + ... + 495466.

It is an arithmetic number, because the mean of its divisors is an integer number (10403946).

Almost surely, 2^40624891 is an apocalyptic number.

40624891 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40624891 is a deficient number, since it is larger than the sum of its proper divisors (990893).

40624891 is an equidigital number, since it uses as much as digits as its factorization.

40624891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990892.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 40624891 is about 6373.7658413218. The cubic root of 40624891 is about 343.7669093170.

The spelling of 40624891 in words is "forty million, six hundred twenty-four thousand, eight hundred ninety-one".