40978987 has 4 divisors (see below), whose sum is σ = 46833136. Its totient is φ = 35124840.

The previous prime is 40978979. The next prime is 40979063. The reversal of 40978987 is 78987904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40978987 - 2³ = 40978979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40978087) 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, 2927064 + ... + 2927077.

It is an arithmetic number, because the mean of its divisors is an integer number (11708284).

Almost surely, 2^40978987 is an apocalyptic number.

40978987 is a deficient number, since it is larger than the sum of its proper divisors (5854149).

40978987 is an equidigital number, since it uses as much as digits as its factorization.

40978987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854148.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 40978987 is about 6401.4831875121. The cubic root of 40978987 is about 344.7628055254.

The spelling of 40978987 in words is "forty million, nine hundred seventy-eight thousand, nine hundred eighty-seven".