1966994890 has 32 divisors (see below), whose sum is σ = 4185924480. Its totient is φ = 651142464.

The previous prime is 1966994879. The next prime is 1966994917. The reversal of 1966994890 is 984996691.

It is a super-2 number, since 2×1966994890² = 7738137794572224200, which contains 22 as substring.

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, 482452 + ... + 486511.

It is an arithmetic number, because the mean of its divisors is an integer number (130810140).

Almost surely, 2^1966994890 is an apocalyptic number.

1966994890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966994890 is an abundant number, since it is smaller than the sum of its proper divisors (2218929590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1966994890 is a wasteful number, since it uses less digits than its factorization.

1966994890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969006.

The product of its (nonzero) digits is 7558272, while the sum is 61.

The square root of 1966994890 is about 44350.8161142498. The cubic root of 1966994890 is about 1252.9519332512.

The spelling of 1966994890 in words is "one billion, nine hundred sixty-six million, nine hundred ninety-four thousand, eight hundred ninety".