1966420939 has 8 divisors (see below), whose sum is σ = 2257153760. Its totient is φ = 1678142016.

The previous prime is 1966420927. The next prime is 1966420961. The reversal of 1966420939 is 9390246691.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1966420939 is a prime.

It is a super-2 number, since 2×1966420939² = 7733622618675283442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966420892 and 1966420901.

It is not an unprimeable number, because it can be changed into a prime (1966420919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611754 + ... + 614959.

It is an arithmetic number, because the mean of its divisors is an integer number (282144220).

Almost surely, 2^1966420939 is an apocalyptic number.

1966420939 is a deficient number, since it is larger than the sum of its proper divisors (290732821).

1966420939 is a wasteful number, since it uses less digits than its factorization.

1966420939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226949.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 1966420939 is about 44344.3450622512. The cubic root of 1966420939 is about 1252.8300547831.

The spelling of 1966420939 in words is "one billion, nine hundred sixty-six million, four hundred twenty thousand, nine hundred thirty-nine".