1220648437 has 8 divisors (see below), whose sum is σ = 1230783840. Its totient is φ = 1210525680.

The previous prime is 1220648431. The next prime is 1220648441. The reversal of 1220648437 is 7348460221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220648437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220648396 and 1220648405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220648431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336043 + ... + 339655.

It is an arithmetic number, because the mean of its divisors is an integer number (153847980).

Almost surely, 2^1220648437 is an apocalyptic number.

It is an amenable number.

1220648437 is a deficient number, since it is larger than the sum of its proper divisors (10135403).

1220648437 is a wasteful number, since it uses less digits than its factorization.

1220648437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 1220648437 is about 34937.7795087209. The cubic root of 1220648437 is about 1068.7190065132.

The spelling of 1220648437 in words is "one billion, two hundred twenty million, six hundred forty-eight thousand, four hundred thirty-seven".