1977923471 has 4 divisors (see below), whose sum is σ = 1980523344. Its totient is φ = 1975323600.

The previous prime is 1977923459. The next prime is 1977923489. The reversal of 1977923471 is 1743297791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1743297791 = 3613 ⋅482507.

It is a cyclic number.

It is not a de Polignac number, because 1977923471 - 2⁶ = 1977923407 is a prime.

It is a super-3 number, since 3×1977923471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977923491) 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, 1298795 + ... + 1300316.

It is an arithmetic number, because the mean of its divisors is an integer number (495130836).

Almost surely, 2^1977923471 is an apocalyptic number.

1977923471 is a deficient number, since it is larger than the sum of its proper divisors (2599873).

1977923471 is an equidigital number, since it uses as much as digits as its factorization.

1977923471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599872.

The product of its digits is 666792, while the sum is 50.

The square root of 1977923471 is about 44473.8515422265. The cubic root of 1977923471 is about 1255.2681069290.

The spelling of 1977923471 in words is "one billion, nine hundred seventy-seven million, nine hundred twenty-three thousand, four hundred seventy-one".