1220778237 has 16 divisors (see below), whose sum is σ = 1861368320. Its totient is φ = 697162032.

The previous prime is 1220778217. The next prime is 1220778241. The reversal of 1220778237 is 7328770221.

It is not a de Polignac number, because 1220778237 - 2¹⁸ = 1220516093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220778195 and 1220778204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220778217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19314 + ... + 53052.

It is an arithmetic number, because the mean of its divisors is an integer number (116335520).

Almost surely, 2^1220778237 is an apocalyptic number.

It is an amenable number.

1220778237 is a deficient number, since it is larger than the sum of its proper divisors (640590083).

1220778237 is a wasteful number, since it uses less digits than its factorization.

1220778237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35472.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 1220778237 is about 34939.6370473421. The cubic root of 1220778237 is about 1068.7568866011.

The spelling of 1220778237 in words is "one billion, two hundred twenty million, seven hundred seventy-eight thousand, two hundred thirty-seven".