1981064 has 8 divisors (see below), whose sum is σ = 3714510. Its totient is φ = 990528.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981064 is 4601891.

1981064 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 136900 = 1358^2 + 370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1981064² = 7849229144192, which contains 22 as substring.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123809 + ... + 123824.

2^1981064 is an apocalyptic number.

It is an amenable number.

1981064 is a deficient number, since it is larger than the sum of its proper divisors (1733446).

1981064 is a wasteful number, since it uses less digits than its factorization.

1981064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247639 (or 247635 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1981064 is about 1407.5027531057. The cubic root of 1981064 is about 125.5932123396.

The spelling of 1981064 in words is "one million, nine hundred eighty-one thousand, sixty-four".