40813989 has 4 divisors (see below), whose sum is σ = 54418656. Its totient is φ = 27209324.

The previous prime is 40813979. The next prime is 40814023. The reversal of 40813989 is 98931804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40813989 - 2¹⁶ = 40748453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40813989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40813909) 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, 6802329 + ... + 6802334.

It is an arithmetic number, because the mean of its divisors is an integer number (13604664).

Almost surely, 2^40813989 is an apocalyptic number.

It is an amenable number.

40813989 is a deficient number, since it is larger than the sum of its proper divisors (13604667).

40813989 is a wasteful number, since it uses less digits than its factorization.

40813989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13604666.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 40813989 is about 6388.5827066729. The cubic root of 40813989 is about 344.2994648690.

The spelling of 40813989 in words is "forty million, eight hundred thirteen thousand, nine hundred eighty-nine".