1966738990 has 32 divisors (see below), whose sum is σ = 3594375360. Its totient is φ = 774676224.

The previous prime is 1966738973. The next prime is 1966739009. The reversal of 1966738990 is 998376691.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550831 + ... + 554389.

It is an arithmetic number, because the mean of its divisors is an integer number (112324230).

Almost surely, 2^1966738990 is an apocalyptic number.

1966738990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966738990 is a deficient number, since it is larger than the sum of its proper divisors (1627636370).

1966738990 is a wasteful number, since it uses less digits than its factorization.

1966738990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The square root of 1966738990 is about 44347.9310678638. The cubic root of 1966738990 is about 1252.8975958273.

The spelling of 1966738990 in words is "one billion, nine hundred sixty-six million, seven hundred thirty-eight thousand, nine hundred ninety".