40978731 has 8 divisors (see below), whose sum is σ = 54676944. Its totient is φ = 27299840.

The previous prime is 40978697. The next prime is 40978739. The reversal of 40978731 is 13787904.

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

It is a cyclic number.

It is not a de Polignac number, because 40978731 - 2¹⁰ = 40977707 is a prime.

It is a super-2 number, since 2×40978731² = 3358512788740722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40978731.

It is not an unprimeable number, because it can be changed into a prime (40978739) 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, 1195 + ... + 9131.

It is an arithmetic number, because the mean of its divisors is an integer number (6834618).

Almost surely, 2^40978731 is an apocalyptic number.

40978731 is a deficient number, since it is larger than the sum of its proper divisors (13698213).

40978731 is a wasteful number, since it uses less digits than its factorization.

40978731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9661.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 40978731 is about 6401.4631921148. The cubic root of 40978731 is about 344.7620876009.

The spelling of 40978731 in words is "forty million, nine hundred seventy-eight thousand, seven hundred thirty-one".