2179989946 has 4 divisors (see below), whose sum is σ = 3269984922. Its totient is φ = 1089994972.

The previous prime is 2179989923. The next prime is 2179989949. The reversal of 2179989946 is 6499899712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2062158921 + 117831025 = 45411^2 + 10855^2 .

It is a super-2 number, since 2×2179989946² = 9504712329322165832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2179989949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544997485 + ... + 544997488.

Almost surely, 2^2179989946 is an apocalyptic number.

2179989946 is a deficient number, since it is larger than the sum of its proper divisors (1089994976).

2179989946 is a wasteful number, since it uses less digits than its factorization.

2179989946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089994975.

The product of its digits is 17635968, while the sum is 64.

The square root of 2179989946 is about 46690.3624530802. The cubic root of 2179989946 is about 1296.6362636376.

The spelling of 2179989946 in words is "two billion, one hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred forty-six".