40663642 has 8 divisors (see below), whose sum is σ = 61059636. Its totient is φ = 20310432.

The previous prime is 40663639. The next prime is 40663657. The reversal of 40663642 is 24636604.

It can be written as a sum of positive squares in 2 ways, for example, as 38700841 + 1962801 = 6221^2 + 1401^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8203 + ... + 12190.

Almost surely, 2^40663642 is an apocalyptic number.

40663642 is a deficient number, since it is larger than the sum of its proper divisors (20395994).

40663642 is a wasteful number, since it uses less digits than its factorization.

40663642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21392.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 40663642 is about 6376.8049993708. The cubic root of 40663642 is about 343.8761779435.

The spelling of 40663642 in words is "forty million, six hundred sixty-three thousand, six hundred forty-two".