1978480 has 40 divisors (see below), whose sum is σ = 5258592. Its totient is φ = 678144.

The previous prime is 1978469. The next prime is 1978507. The reversal of 1978480 is 848791.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1978480² = 7828766220800, which contains 22 as substring.

It is a zygodrome in base 2.

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, 1207 + ... + 2326.

2^1978480 is an apocalyptic number.

1978480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978480 is an abundant number, since it is smaller than the sum of its proper divisors (3280112).

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

1978480 is a wasteful number, since it uses less digits than its factorization.

1978480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553 (or 3547 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1978480 is about 1406.5845157686. The cubic root of 1978480 is about 125.5385827627.

The spelling of 1978480 in words is "one million, nine hundred seventy-eight thousand, four hundred eighty".