1928131401 has 16 divisors (see below), whose sum is σ = 2956135424. Its totient is φ = 1095027984.

The previous prime is 1928131391. The next prime is 1928131421. The reversal of 1928131401 is 1041318291.

It is not a de Polignac number, because 1928131401 - 2²¹ = 1926034249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928131421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278221 + ... + 285066.

It is an arithmetic number, because the mean of its divisors is an integer number (184758464).

Almost surely, 2^1928131401 is an apocalyptic number.

It is an amenable number.

1928131401 is a deficient number, since it is larger than the sum of its proper divisors (1028004023).

1928131401 is a wasteful number, since it uses less digits than its factorization.

1928131401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563460.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1928131401 is about 43910.4930625927. The cubic root of 1928131401 is about 1244.6451252234.

Adding to 1928131401 its reverse (1041318291), we get a palindrome (2969449692).

The spelling of 1928131401 in words is "one billion, nine hundred twenty-eight million, one hundred thirty-one thousand, four hundred one".