40451999 has 6 divisors (see below), whose sum is σ = 47056464. Its totient is φ = 34673100.

The previous prime is 40451981. The next prime is 40452019. The reversal of 40451999 is 99915404.

It is a happy number.

It is not a de Polignac number, because 40451999 - 2⁸ = 40451743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40451599) 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 5 ways as a sum of consecutive naturals, for example, 412727 + ... + 412824.

It is an arithmetic number, because the mean of its divisors is an integer number (7842744).

Almost surely, 2^40451999 is an apocalyptic number.

40451999 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

40451999 is a deficient number, since it is larger than the sum of its proper divisors (6604465).

40451999 is an equidigital number, since it uses as much as digits as its factorization.

40451999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825565 (or 825558 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 40451999 is about 6360.1885978326. The cubic root of 40451999 is about 343.2785464679.

The spelling of 40451999 in words is "forty million, four hundred fifty-one thousand, nine hundred ninety-nine".