1977634445 has 8 divisors (see below), whose sum is σ = 2381608440. Its totient is φ = 1576476160.

The previous prime is 1977634427. The next prime is 1977634447. The reversal of 1977634445 is 5444367791.

It can be written as a sum of positive squares in 4 ways, for example, as 5031049 + 1972603396 = 2243^2 + 44414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1977634445 - 2⁸ = 1977634189 is a prime.

It is a super-2 number, since 2×1977634445² = 7822075996100916050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1977634393 and 1977634402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977634447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702380 + ... + 705189.

It is an arithmetic number, because the mean of its divisors is an integer number (297701055).

Almost surely, 2^1977634445 is an apocalyptic number.

It is an amenable number.

1977634445 is a deficient number, since it is larger than the sum of its proper divisors (403973995).

1977634445 is a wasteful number, since it uses less digits than its factorization.

1977634445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407855.

The product of its digits is 2540160, while the sum is 50.

The square root of 1977634445 is about 44470.6020310047. The cubic root of 1977634445 is about 1255.2069615243.

The spelling of 1977634445 in words is "one billion, nine hundred seventy-seven million, six hundred thirty-four thousand, four hundred forty-five".