1220156454 has 16 divisors (see below), whose sum is σ = 2662159680. Its totient is φ = 369744360.

The previous prime is 1220156449. The next prime is 1220156467. The reversal of 1220156454 is 4546510221.

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, 9243544 + ... + 9243675.

It is an arithmetic number, because the mean of its divisors is an integer number (166384980).

Almost surely, 2^1220156454 is an apocalyptic number.

1220156454 is an abundant number, since it is smaller than the sum of its proper divisors (1442003226).

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

1220156454 is a wasteful number, since it uses less digits than its factorization.

1220156454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18487235.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1220156454 is about 34930.7379538423. The cubic root of 1220156454 is about 1068.5754046310.

Adding to 1220156454 its reverse (4546510221), we get a palindrome (5766666675).

The spelling of 1220156454 in words is "one billion, two hundred twenty million, one hundred fifty-six thousand, four hundred fifty-four".