1920427 has 2 divisors, whose sum is σ = 1920428. Its totient is φ = 1920426.

The previous prime is 1920407. The next prime is 1920433. The reversal of 1920427 is 7240291.

It is a strong prime.

It is an emirp because it is prime and its reverse (7240291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1920427 - 2⁷ = 1920299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960213 + 960214.

It is an arithmetic number, because the mean of its divisors is an integer number (960214).

2^1920427 is an apocalyptic number.

1920427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920427 is an equidigital number, since it uses as much as digits as its factorization.

1920427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1920427 is about 1385.7947178424. The cubic root of 1920427 is about 124.2985133627.

It can be divided in two parts, 1920 and 427, that multiplied together give a triangular number (819840 = T₁₂₈₀).

The spelling of 1920427 in words is "one million, nine hundred twenty thousand, four hundred twenty-seven".