1920419957 has 2 divisors, whose sum is σ = 1920419958. Its totient is φ = 1920419956.

The previous prime is 1920419939. The next prime is 1920419993. The reversal of 1920419957 is 7599140291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1821497041 + 98922916 = 42679^2 + 9946^2 .

It is an emirp because it is prime and its reverse (7599140291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1920419957 - 2²⁸ = 1651984501 is a prime.

It is a super-2 number, since 2×1920419957² = 7376025622487763698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920419257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960209978 + 960209979.

It is an arithmetic number, because the mean of its divisors is an integer number (960209979).

Almost surely, 2^1920419957 is an apocalyptic number.

It is an amenable number.

1920419957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920419957 is an equidigital number, since it uses as much as digits as its factorization.

1920419957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 1920419957 is about 43822.5964201119. The cubic root of 1920419957 is about 1242.9836141117.

The spelling of 1920419957 in words is "one billion, nine hundred twenty million, four hundred nineteen thousand, nine hundred fifty-seven".