1401928789 has 2 divisors, whose sum is σ = 1401928790. Its totient is φ = 1401928788.

The previous prime is 1401928771. The next prime is 1401928793. The reversal of 1401928789 is 9878291041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1151244900 + 250683889 = 33930^2 + 15833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401928789 - 2¹⁵ = 1401896021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401928189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700964394 + 700964395.

It is an arithmetic number, because the mean of its divisors is an integer number (700964395).

Almost surely, 2^1401928789 is an apocalyptic number.

It is an amenable number.

1401928789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401928789 is an equidigital number, since it uses as much as digits as its factorization.

1401928789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 1401928789 is about 37442.3395235928. The cubic root of 1401928789 is about 1119.2024479824.

The spelling of 1401928789 in words is "one billion, four hundred one million, nine hundred twenty-eight thousand, seven hundred eighty-nine".