1900128927401 has 4 divisors (see below), whose sum is σ = 1900138947012. Its totient is φ = 1900118907792.

The previous prime is 1900128927391. The next prime is 1900128927409. The reversal of 1900128927401 is 1047298210091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 406404975001 + 1493723952400 = 637499^2 + 1222180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1900128927401 is a prime.

It is a super-2 number, since 2×1900128927401² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1900128927409) 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, 4719746 + ... + 5106491.

It is an arithmetic number, because the mean of its divisors is an integer number (475034736753).

Almost surely, 2^{1900128927401} is an apocalyptic number.

It is an amenable number.

1900128927401 is a deficient number, since it is larger than the sum of its proper divisors (10019611).

1900128927401 is an equidigital number, since it uses as much as digits as its factorization.

1900128927401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019610.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 1900128927401 in words is "one trillion, nine hundred billion, one hundred twenty-eight million, nine hundred twenty-seven thousand, four hundred one".