40978613 has 12 divisors (see below), whose sum is σ = 45413280. Its totient is φ = 36940176.

The previous prime is 40978601. The next prime is 40978633. The reversal of 40978613 is 31687904.

It is not a de Polignac number, because 40978613 - 2¹⁰ = 40977589 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40978633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4448 + ... + 10086.

It is an arithmetic number, because the mean of its divisors is an integer number (3784440).

Almost surely, 2^40978613 is an apocalyptic number.

40978613 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

40978613 is a deficient number, since it is larger than the sum of its proper divisors (4434667).

40978613 is a wasteful number, since it uses less digits than its factorization.

40978613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 40978613 is about 6401.4539754653. The cubic root of 40978613 is about 344.7617566815.

The spelling of 40978613 in words is "forty million, nine hundred seventy-eight thousand, six hundred thirteen".