1220138004 has 24 divisors (see below), whose sum is σ = 2857821120. Its totient is φ = 405165184.

The previous prime is 1220137979. The next prime is 1220138077. The reversal of 1220138004 is 4008310221.

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 7 ways as a sum of consecutive naturals, for example, 190149 + ... + 196460.

It is an arithmetic number, because the mean of its divisors is an integer number (119075880).

Almost surely, 2^1220138004 is an apocalyptic number.

It is an amenable number.

1220138004 is an abundant number, since it is smaller than the sum of its proper divisors (1637683116).

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

1220138004 is a wasteful number, since it uses less digits than its factorization.

1220138004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386879 (or 386877 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1220138004 is about 34930.4738587956. The cubic root of 1220138004 is about 1068.5700186235.

Adding to 1220138004 its reverse (4008310221), we get a palindrome (5228448225).

It can be divided in two parts, 12201 and 38004, that added together give a palindrome (50205).

The spelling of 1220138004 in words is "one billion, two hundred twenty million, one hundred thirty-eight thousand, four".