19940477 has 2 divisors, whose sum is σ = 19940478. Its totient is φ = 19940476.

The previous prime is 19940449. The next prime is 19940489. The reversal of 19940477 is 77404991.

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., 14055001 + 5885476 = 3749^2 + 2426^2 .

It is a cyclic number.

It is not a de Polignac number, because 19940477 - 2²⁴ = 3163261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19940497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970238 + 9970239.

It is an arithmetic number, because the mean of its divisors is an integer number (9970239).

Almost surely, 2^19940477 is an apocalyptic number.

It is an amenable number.

19940477 is a deficient number, since it is larger than the sum of its proper divisors (1).

19940477 is an equidigital number, since it uses as much as digits as its factorization.

19940477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 19940477 is about 4465.4761224308. The cubic root of 19940477 is about 271.1722102743.

The spelling of 19940477 in words is "nineteen million, nine hundred forty thousand, four hundred seventy-seven".