1978470 has 96 divisors (see below), whose sum is σ = 5896800. Its totient is φ = 456192.

The previous prime is 1978469. The next prime is 1978507. The reversal of 1978470 is 748791.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22186 + ... + 22274.

It is an arithmetic number, because the mean of its divisors is an integer number (61425).

2^1978470 is an apocalyptic number.

1978470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2948400).

1978470 is an abundant number, since it is smaller than the sum of its proper divisors (3918330).

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

1978470 is a wasteful number, since it uses less digits than its factorization.

1978470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 1978470 is about 1406.5809610541. The cubic root of 1978470 is about 125.5383712555.

The spelling of 1978470 in words is "one million, nine hundred seventy-eight thousand, four hundred seventy".