19402861 has 2 divisors, whose sum is σ = 19402862. Its totient is φ = 19402860.

The previous prime is 19402843. The next prime is 19402879. The reversal of 19402861 is 16820491.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19402843) and next prime (19402879).

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 7257636 = 3485^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 19402861 - 2⁹ = 19402349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19402811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701430 + 9701431.

It is an arithmetic number, because the mean of its divisors is an integer number (9701431).

Almost surely, 2^19402861 is an apocalyptic number.

It is an amenable number.

19402861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402861 is an equidigital number, since it uses as much as digits as its factorization.

19402861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 19402861 is about 4404.8678754305. The cubic root of 19402861 is about 268.7129463247.

The spelling of 19402861 in words is "nineteen million, four hundred two thousand, eight hundred sixty-one".