1219857401 has 6 divisors (see below), whose sum is σ = 1419017850. Its totient is φ = 1045592016.

The previous prime is 1219857377. The next prime is 1219857433. The reversal of 1219857401 is 1047589121.

It can be written as a sum of positive squares in only one way, i.e., 1145484025 + 74373376 = 33845^2 + 8624^2 .

It is not a de Polignac number, because 1219857401 - 2⁶ = 1219857337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1219857451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12447476 + ... + 12447573.

It is an arithmetic number, because the mean of its divisors is an integer number (236502975).

Almost surely, 2^1219857401 is an apocalyptic number.

It is an amenable number.

1219857401 is a deficient number, since it is larger than the sum of its proper divisors (199160449).

1219857401 is an equidigital number, since it uses as much as digits as its factorization.

1219857401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24895063 (or 24895056 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1219857401 is about 34926.4570347466. The cubic root of 1219857401 is about 1068.4880970319.

The spelling of 1219857401 in words is "one billion, two hundred nineteen million, eight hundred fifty-seven thousand, four hundred one".