1219185040 has 40 divisors (see below), whose sum is σ = 2881085688. Its totient is φ = 479677440.

The previous prime is 1219185001. The next prime is 1219185041. The reversal of 1219185040 is 405819121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43243776 + 1175941264 = 6576^2 + 34292^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1219184993 and 1219185011.

It is not an unprimeable number, because it can be changed into a prime (1219185041) 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, 120037 + ... + 129796.

Almost surely, 2^1219185040 is an apocalyptic number.

1219185040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1219185040 is an abundant number, since it is smaller than the sum of its proper divisors (1661900648).

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

1219185040 is a wasteful number, since it uses less digits than its factorization.

1219185040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249907 (or 249901 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1219185040 is about 34916.8303257899. The cubic root of 1219185040 is about 1068.2917511978.

The spelling of 1219185040 in words is "one billion, two hundred nineteen million, one hundred eighty-five thousand, forty".