1992418397 has 4 divisors (see below), whose sum is σ = 1992867516. Its totient is φ = 1991969280.

The previous prime is 1992418387. The next prime is 1992418409. The reversal of 1992418397 is 7938142991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7938142991 = 83 ⋅95640277.

It can be written as a sum of positive squares in 2 ways, for example, as 543169636 + 1449248761 = 23306^2 + 38069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992418397 - 2¹⁸ = 1992156253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992418327) 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 in 3 ways as a sum of consecutive naturals, for example, 217838 + ... + 226799.

It is an arithmetic number, because the mean of its divisors is an integer number (498216879).

Almost surely, 2^1992418397 is an apocalyptic number.

It is an amenable number.

1992418397 is a deficient number, since it is larger than the sum of its proper divisors (449119).

1992418397 is an equidigital number, since it uses as much as digits as its factorization.

1992418397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449118.

The product of its digits is 979776, while the sum is 53.

The square root of 1992418397 is about 44636.5141672152. The cubic root of 1992418397 is about 1258.3269970803.

The spelling of 1992418397 in words is "one billion, nine hundred ninety-two million, four hundred eighteen thousand, three hundred ninety-seven".