40301981 has 2 divisors, whose sum is σ = 40301982. Its totient is φ = 40301980.

The previous prime is 40301977. The next prime is 40301993. The reversal of 40301981 is 18910304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 737881 = 6290^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 40301981 - 2² = 40301977 is a prime.

It is a super-2 number, since 2×40301981² = 3248499345048722, 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 40301981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40301971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20150990 + 20150991.

It is an arithmetic number, because the mean of its divisors is an integer number (20150991).

Almost surely, 2^40301981 is an apocalyptic number.

It is an amenable number.

40301981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40301981 is an equidigital number, since it uses as much as digits as its factorization.

40301981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 40301981 is about 6348.3841251140. The cubic root of 40301981 is about 342.8536663255.

The spelling of 40301981 in words is "forty million, three hundred one thousand, nine hundred eighty-one".