1220001898 has 16 divisors (see below), whose sum is σ = 1855647360. Its totient is φ = 601473600.

The previous prime is 1220001877. The next prime is 1220001907. The reversal of 1220001898 is 8981000221.

It is a happy number.

It is a super-2 number, since 2×1220001898² = 2976809262247204808, which contains 22 as substring.

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, 123378 + ... + 132898.

It is an arithmetic number, because the mean of its divisors is an integer number (115977960).

Almost surely, 2^1220001898 is an apocalyptic number.

1220001898 is a deficient number, since it is larger than the sum of its proper divisors (635645462).

1220001898 is an equidigital number, since it uses as much as digits as its factorization.

1220001898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10413.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1220001898 is about 34928.5255629264. The cubic root of 1220001898 is about 1068.5302842659.

The spelling of 1220001898 in words is "one billion, two hundred twenty million, one thousand, eight hundred ninety-eight".