1581400980 has 72 divisors (see below), whose sum is σ = 4805833032. Its totient is φ = 420923136.

The previous prime is 1581400973. The next prime is 1581400993. The reversal of 1581400980 is 890041851.

It can be written as a sum of positive squares in 4 ways, for example, as 23677956 + 1557723024 = 4866^2 + 39468^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92374 + ... + 108146.

It is an arithmetic number, because the mean of its divisors is an integer number (66747681).

Almost surely, 2^1581400980 is an apocalyptic number.

1581400980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581400980 is an abundant number, since it is smaller than the sum of its proper divisors (3224432052).

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

1581400980 is a wasteful number, since it uses less digits than its factorization.

1581400980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16345 (or 16340 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1581400980 is about 39766.8326624085. The cubic root of 1581400980 is about 1165.0574317626.

The spelling of 1581400980 in words is "one billion, five hundred eighty-one million, four hundred thousand, nine hundred eighty".