40619861 has 2 divisors, whose sum is σ = 40619862. Its totient is φ = 40619860.

The previous prime is 40619857. The next prime is 40619879. The reversal of 40619861 is 16891604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34739236 + 5880625 = 5894^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 40619861 - 2² = 40619857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40619261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20309930 + 20309931.

It is an arithmetic number, because the mean of its divisors is an integer number (20309931).

Almost surely, 2^40619861 is an apocalyptic number.

It is an amenable number.

40619861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40619861 is an equidigital number, since it uses as much as digits as its factorization.

40619861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40619861 is about 6373.3712429138. The cubic root of 40619861 is about 343.7527208159.

The spelling of 40619861 in words is "forty million, six hundred nineteen thousand, eight hundred sixty-one".