1964640 has 48 divisors (see below), whose sum is σ = 6190128. Its totient is φ = 523776.

The previous prime is 1964629. The next prime is 1964659. The reversal of 1964640 is 464691.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1964598 and 1964607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567 + ... + 2526.

It is an arithmetic number, because the mean of its divisors is an integer number (128961).

2^1964640 is an apocalyptic number.

1964640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1964640 is an abundant number, since it is smaller than the sum of its proper divisors (4225488).

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

1964640 is a wasteful number, since it uses less digits than its factorization.

1964640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1964640 is about 1401.6561632583. The cubic root of 1964640 is about 125.2451721439.

The spelling of 1964640 in words is "one million, nine hundred sixty-four thousand, six hundred forty".