1954420493 has 4 divisors (see below), whose sum is σ = 1962025500. Its totient is φ = 1946815488.

The previous prime is 1954420471. The next prime is 1954420499. The reversal of 1954420493 is 3940244591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3940244591 = 701 ⋅5620891.

It can be written as a sum of positive squares in 2 ways, for example, as 1307328649 + 647091844 = 36157^2 + 25438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954420493 - 2¹² = 1954416397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1954420493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1954420499) 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, 3802118 + ... + 3802631.

It is an arithmetic number, because the mean of its divisors is an integer number (490506375).

Almost surely, 2^1954420493 is an apocalyptic number.

It is an amenable number.

1954420493 is a deficient number, since it is larger than the sum of its proper divisors (7605007).

1954420493 is an equidigital number, since it uses as much as digits as its factorization.

1954420493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7605006.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 1954420493 is about 44208.8282246883. The cubic root of 1954420493 is about 1250.2763107574.

The spelling of 1954420493 in words is "one billion, nine hundred fifty-four million, four hundred twenty thousand, four hundred ninety-three".