36778421 has 2 divisors, whose sum is σ = 36778422. Its totient is φ = 36778420.

The previous prime is 36778411. The next prime is 36778447. The reversal of 36778421 is 12487763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 6682225 = 5486^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 36778421 - 2¹⁰ = 36777397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36778411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18389210 + 18389211.

It is an arithmetic number, because the mean of its divisors is an integer number (18389211).

Almost surely, 2^36778421 is an apocalyptic number.

It is an amenable number.

36778421 is a deficient number, since it is larger than the sum of its proper divisors (1).

36778421 is an equidigital number, since it uses as much as digits as its factorization.

36778421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 36778421 is about 6064.5214980244. The cubic root of 36778421 is about 332.5556723634. Note that the first 3 decimals are identical.

The spelling of 36778421 in words is "thirty-six million, seven hundred seventy-eight thousand, four hundred twenty-one".