1213147980 has 144 divisors (see below), whose sum is σ = 4024919808. Its totient is φ = 293328000.

The previous prime is 1213147927. The next prime is 1213147993. The reversal of 1213147980 is 897413121.

It is a happy number.

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

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, 1248895 + ... + 1249865.

It is an arithmetic number, because the mean of its divisors is an integer number (27950832).

Almost surely, 2^1213147980 is an apocalyptic number.

1213147980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213147980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2012459904).

1213147980 is an abundant number, since it is smaller than the sum of its proper divisors (2811771828).

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

1213147980 is a wasteful number, since it uses less digits than its factorization.

1213147980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1623 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1213147980 is about 34830.2739007318. The cubic root of 1213147980 is about 1066.5255397055.

The spelling of 1213147980 in words is "one billion, two hundred thirteen million, one hundred forty-seven thousand, nine hundred eighty".