1964991 has 16 divisors (see below), whose sum is σ = 3020544. Its totient is φ = 1113024.

The previous prime is 1964987. The next prime is 1965077. The reversal of 1964991 is 1994691.

It is not a de Polignac number, because 1964991 - 2² = 1964987 is a prime.

It is a super-2 number, since 2×1964991² = 7722379260162, which contains 22 as substring.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2536 + ... + 3218.

It is an arithmetic number, because the mean of its divisors is an integer number (188784).

2^1964991 is an apocalyptic number.

1964991 is a deficient number, since it is larger than the sum of its proper divisors (1055553).

1964991 is a wasteful number, since it uses less digits than its factorization.

1964991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 17496, while the sum is 39.

The square root of 1964991 is about 1401.7813666903. The cubic root of 1964991 is about 125.2526304124.

The spelling of 1964991 in words is "one million, nine hundred sixty-four thousand, nine hundred ninety-one".