40320451 has 12 divisors (see below), whose sum is σ = 43275504. Its totient is φ = 37551600.

The previous prime is 40320431. The next prime is 40320461. The reversal of 40320451 is 15402304.

It is not a de Polignac number, because 40320451 - 2⁷ = 40320323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40320431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21106 + ... + 22936.

It is an arithmetic number, because the mean of its divisors is an integer number (3606292).

Almost surely, 2^40320451 is an apocalyptic number.

40320451 is a deficient number, since it is larger than the sum of its proper divisors (2955053).

40320451 is a wasteful number, since it uses less digits than its factorization.

40320451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930 (or 1911 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40320451 is about 6349.8386593677. The cubic root of 40320451 is about 342.9060338100.

Adding to 40320451 its reverse (15402304), we get a palindrome (55722755).

The spelling of 40320451 in words is "forty million, three hundred twenty thousand, four hundred fifty-one".