1220138437983 has 4 divisors (see below), whose sum is σ = 1626851250648. Its totient is φ = 813425625320.

The previous prime is 1220138437979. The next prime is 1220138438003. The reversal of 1220138437983 is 3897348310221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220138437983 - 2² = 1220138437979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220138438983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203356406328 + ... + 203356406333.

It is an arithmetic number, because the mean of its divisors is an integer number (406712812662).

Almost surely, 2^{1220138437983} is an apocalyptic number.

1220138437983 is a deficient number, since it is larger than the sum of its proper divisors (406712812665).

1220138437983 is an equidigital number, since it uses as much as digits as its factorization.

1220138437983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406712812664.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 1220138437983 in words is "one trillion, two hundred twenty billion, one hundred thirty-eight million, four hundred thirty-seven thousand, nine hundred eighty-three".