1964297440 has 192 divisors, whose sum is σ = 5510260224. Its totient is φ = 647682048.

The previous prime is 1964297437. The next prime is 1964297473. The reversal of 1964297440 is 447924691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4433859 + ... + 4434301.

It is an arithmetic number, because the mean of its divisors is an integer number (28699272).

Almost surely, 2^1964297440 is an apocalyptic number.

1964297440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1964297440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2755130112).

1964297440 is an abundant number, since it is smaller than the sum of its proper divisors (3545962784).

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

1964297440 is a wasteful number, since it uses less digits than its factorization.

1964297440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1964297440 is about 44320.3953050963. The cubic root of 1964297440 is about 1252.3789235727.

The spelling of 1964297440 in words is "one billion, nine hundred sixty-four million, two hundred ninety-seven thousand, four hundred forty".