1964391 has 32 divisors (see below), whose sum is σ = 3252480. Its totient is φ = 1036800.

The previous prime is 1964387. The next prime is 1964399. The reversal of 1964391 is 1934691.

It is not a de Polignac number, because 1964391 - 2² = 1964387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8031 + ... + 8271.

It is an arithmetic number, because the mean of its divisors is an integer number (101640).

2^1964391 is an apocalyptic number.

1964391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1964391 is a deficient number, since it is larger than the sum of its proper divisors (1288089).

1964391 is a wasteful number, since it uses less digits than its factorization.

1964391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its digits is 5832, while the sum is 33.

The square root of 1964391 is about 1401.5673369482. The cubic root of 1964391 is about 125.2398806969.

The spelling of 1964391 in words is "one million, nine hundred sixty-four thousand, three hundred ninety-one".