1978464 has 48 divisors (see below), whose sum is σ = 5343408. Its totient is φ = 640512.

The previous prime is 1978463. The next prime is 1978469. The reversal of 1978464 is 4648791.

It is a happy number.

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

It is an Ulam number.

It is a zygodrome in base 2 and base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3274 + ... + 3830.

It is an arithmetic number, because the mean of its divisors is an integer number (111321).

2^1978464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2671704).

1978464 is an abundant number, since it is smaller than the sum of its proper divisors (3364944).

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

1978464 is a wasteful number, since it uses less digits than its factorization.

1978464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 599 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 1978464 is about 1406.5788282212. The cubic root of 1978464 is about 125.5382443509.

It can be divided in two parts, 1978 and 464, that added together give a palindrome (2442).

The spelling of 1978464 in words is "one million, nine hundred seventy-eight thousand, four hundred sixty-four".