1220137798 has 16 divisors (see below), whose sum is σ = 2001485520. Its totient is φ = 553248000.

The previous prime is 1220137783. The next prime is 1220137811. The reversal of 1220137798 is 8977310221.

It is a happy number.

It is a super-2 number, since 2×1220137798² = 2977472492216577608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220137798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58803 + ... + 76798.

It is an arithmetic number, because the mean of its divisors is an integer number (125092845).

Almost surely, 2^1220137798 is an apocalyptic number.

1220137798 is a deficient number, since it is larger than the sum of its proper divisors (781347722).

1220137798 is a wasteful number, since it uses less digits than its factorization.

1220137798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136023.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 1220137798 is about 34930.4709100808. The cubic root of 1220137798 is about 1068.5699584867.

The spelling of 1220137798 in words is "one billion, two hundred twenty million, one hundred thirty-seven thousand, seven hundred ninety-eight".