1977423445 has 4 divisors (see below), whose sum is σ = 2372908140. Its totient is φ = 1581938752.

The previous prime is 1977423439. The next prime is 1977423463. The reversal of 1977423445 is 5443247791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 542377521 + 1435045924 = 23289^2 + 37882^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977423445 - 2⁹ = 1977422933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977423395 and 1977423404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197742340 + ... + 197742349.

It is an arithmetic number, because the mean of its divisors is an integer number (593227035).

Almost surely, 2^1977423445 is an apocalyptic number.

It is an amenable number.

1977423445 is a deficient number, since it is larger than the sum of its proper divisors (395484695).

1977423445 is an equidigital number, since it uses as much as digits as its factorization.

1977423445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395484694.

The product of its digits is 846720, while the sum is 46.

The square root of 1977423445 is about 44468.2296139615. The cubic root of 1977423445 is about 1255.1623192853.

The spelling of 1977423445 in words is "one billion, nine hundred seventy-seven million, four hundred twenty-three thousand, four hundred forty-five".