1906877777 has 36 divisors (see below), whose sum is σ = 2383592940. Its totient is φ = 1521037056.

The previous prime is 1906877759. The next prime is 1906877783. The reversal of 1906877777 is 7777786091.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 146991376 + 1759886401 = 12124^2 + 41951^2 .

It is not a de Polignac number, because 1906877777 - 2²⁰ = 1905829201 is a prime.

It is a Duffinian number.

1906877777 is a modest number, since divided by 77777 gives 19068 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1906877737) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21425549 + ... + 21425637.

It is an arithmetic number, because the mean of its divisors is an integer number (66210915).

Almost surely, 2^1906877777 is an apocalyptic number.

1906877777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1906877777 is a deficient number, since it is larger than the sum of its proper divisors (476715163).

1906877777 is an frugal number, since it uses more digits than its factorization.

1906877777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 7260624, while the sum is 59.

The square root of 1906877777 is about 43667.8116809166. The cubic root of 1906877777 is about 1240.0550133848.

The spelling of 1906877777 in words is "one billion, nine hundred six million, eight hundred seventy-seven thousand, seven hundred seventy-seven".