1966897438 has 8 divisors (see below), whose sum is σ = 3218559480. Its totient is φ = 894044280.

The previous prime is 1966897403. The next prime is 1966897453. The reversal of 1966897438 is 8347986691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1966897438² = 7737371063221927688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44702193 + ... + 44702236.

It is an arithmetic number, because the mean of its divisors is an integer number (402319935).

Almost surely, 2^1966897438 is an apocalyptic number.

1966897438 is a deficient number, since it is larger than the sum of its proper divisors (1251662042).

1966897438 is a wasteful number, since it uses less digits than its factorization.

1966897438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89404442.

The product of its digits is 15676416, while the sum is 61.

The square root of 1966897438 is about 44349.7174511856. The cubic root of 1966897438 is about 1252.9312409947.

The spelling of 1966897438 in words is "one billion, nine hundred sixty-six million, eight hundred ninety-seven thousand, four hundred thirty-eight".