40029961 has 2 divisors, whose sum is σ = 40029962. Its totient is φ = 40029960.

The previous prime is 40029901. The next prime is 40029973. The reversal of 40029961 is 16992004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40005625 + 24336 = 6325^2 + 156^2 .

It is a cyclic number.

It is not a de Polignac number, because 40029961 - 2¹⁵ = 39997193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40029901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20014980 + 20014981.

It is an arithmetic number, because the mean of its divisors is an integer number (20014981).

Almost surely, 2^40029961 is an apocalyptic number.

It is an amenable number.

40029961 is a deficient number, since it is larger than the sum of its proper divisors (1).

40029961 is an equidigital number, since it uses as much as digits as its factorization.

40029961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 40029961 is about 6326.9235019874. The cubic root of 40029961 is about 342.0805556739.

The spelling of 40029961 in words is "forty million, twenty-nine thousand, nine hundred sixty-one".