40669749 has 8 divisors (see below), whose sum is σ = 60251520. Its totient is φ = 27113148.

The previous prime is 40669693. The next prime is 40669757. The reversal of 40669749 is 94796604.

It is a de Polignac number, because none of the positive numbers 2^k-40669749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40664749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753117 + ... + 753170.

It is an arithmetic number, because the mean of its divisors is an integer number (7531440).

Almost surely, 2^40669749 is an apocalyptic number.

It is an amenable number.

40669749 is a deficient number, since it is larger than the sum of its proper divisors (19581771).

40669749 is a wasteful number, since it uses less digits than its factorization.

40669749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506296 (or 1506290 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 40669749 is about 6377.2838262069. The cubic root of 40669749 is about 343.8933919017.

The spelling of 40669749 in words is "forty million, six hundred sixty-nine thousand, seven hundred forty-nine".