3977456649 has 4 divisors (see below), whose sum is σ = 5303275536. Its totient is φ = 2651637764.

The previous prime is 3977456569. The next prime is 3977456653. The reversal of 3977456649 is 9466547793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3977456649 - 2⁷ = 3977456521 is a prime.

It is a super-2 number, since 2×3977456649² = 31640322789348618402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3977456592 and 3977456601.

It is not an unprimeable number, because it can be changed into a prime (3977456669) 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, 662909439 + ... + 662909444.

It is an arithmetic number, because the mean of its divisors is an integer number (1325818884).

Almost surely, 2^3977456649 is an apocalyptic number.

It is an amenable number.

3977456649 is a deficient number, since it is larger than the sum of its proper divisors (1325818887).

3977456649 is a wasteful number, since it uses less digits than its factorization.

3977456649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325818886.

The product of its digits is 34292160, while the sum is 60.

The square root of 3977456649 is about 63067.0805492057. The cubic root of 3977456649 is about 1584.4133205379.

The spelling of 3977456649 in words is "three billion, nine hundred seventy-seven million, four hundred fifty-six thousand, six hundred forty-nine".