1901220904 has 16 divisors (see below), whose sum is σ = 3888861120. Its totient is φ = 864191280.

The previous prime is 1901220901. The next prime is 1901220907. The reversal of 1901220904 is 4090221091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1901220901) and next prime (1901220907).

It is a super-2 number, since 2×1901220904² = 7229281851613154432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1901220901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10802304 + ... + 10802479.

It is an arithmetic number, because the mean of its divisors is an integer number (243053820).

Almost surely, 2^1901220904 is an apocalyptic number.

It is an amenable number.

1901220904 is an abundant number, since it is smaller than the sum of its proper divisors (1987640216).

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

1901220904 is a wasteful number, since it uses less digits than its factorization.

1901220904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21604800 (or 21604796 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1901220904 is about 43602.9919156931. The cubic root of 1901220904 is about 1238.8275650550.

Adding to 1901220904 its reverse (4090221091), we get a palindrome (5991441995).

The spelling of 1901220904 in words is "one billion, nine hundred one million, two hundred twenty thousand, nine hundred four".