40637649 has 8 divisors (see below), whose sum is σ = 58351552. Its totient is φ = 25007760.

The previous prime is 40637629. The next prime is 40637659. The reversal of 40637649 is 94673604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40637649 - 2⁵ = 40637617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1041991 = 40637649 / (4 + 0 + 6 + 3 + 7 + 6 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40637629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520957 + ... + 521034.

It is an arithmetic number, because the mean of its divisors is an integer number (7293944).

Almost surely, 2^40637649 is an apocalyptic number.

It is an amenable number.

40637649 is a deficient number, since it is larger than the sum of its proper divisors (17713903).

40637649 is a wasteful number, since it uses less digits than its factorization.

40637649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042007.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 40637649 is about 6374.7665839621. The cubic root of 40637649 is about 343.8028915198.

The spelling of 40637649 in words is "forty million, six hundred thirty-seven thousand, six hundred forty-nine".