40644451 has 4 divisors (see below), whose sum is σ = 41333400. Its totient is φ = 39955504.

The previous prime is 40644437. The next prime is 40644469. The reversal of 40644451 is 15444604.

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 40644451 - 2¹³ = 40636259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40644421) 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, 344386 + ... + 344503.

It is an arithmetic number, because the mean of its divisors is an integer number (10333350).

Almost surely, 2^40644451 is an apocalyptic number.

40644451 is a deficient number, since it is larger than the sum of its proper divisors (688949).

40644451 is an equidigital number, since it uses as much as digits as its factorization.

40644451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688948.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 40644451 is about 6375.3000713692. The cubic root of 40644451 is about 343.8220725572.

It can be divided in two parts, 4064 and 4451, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 40644451 in words is "forty million, six hundred forty-four thousand, four hundred fifty-one".