1543980 has 24 divisors (see below), whose sum is σ = 4323312. Its totient is φ = 411712.

The previous prime is 1543979. The next prime is 1543981. The reversal of 1543980 is 893451.

It is an interprime number because it is at equal distance from previous prime (1543979) and next prime (1543981).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (1543981) 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, 12807 + ... + 12926.

It is an arithmetic number, because the mean of its divisors is an integer number (180138).

2^1543980 is an apocalyptic number.

1543980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1543980 is an abundant number, since it is smaller than the sum of its proper divisors (2779332).

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

1543980 is a wasteful number, since it uses less digits than its factorization.

1543980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25745 (or 25743 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1543980 is about 1242.5699175499. The cubic root of 1543980 is about 115.5794322511.

The spelling of 1543980 in words is "one million, five hundred forty-three thousand, nine hundred eighty".