1977909449 has 8 divisors (see below), whose sum is σ = 2064388032. Its totient is φ = 1891471120.

The previous prime is 1977909419. The next prime is 1977909457. The reversal of 1977909449 is 9449097791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977909449 is a prime.

It is a super-3 number, since 3×1977909449³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1977909419) 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, 135014 + ... + 148944.

It is an arithmetic number, because the mean of its divisors is an integer number (258048504).

Almost surely, 2^1977909449 is an apocalyptic number.

It is an amenable number.

1977909449 is a deficient number, since it is larger than the sum of its proper divisors (86478583).

1977909449 is a wasteful number, since it uses less digits than its factorization.

1977909449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20127.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The square root of 1977909449 is about 44473.6938987532. The cubic root of 1977909449 is about 1255.2651406176.

The spelling of 1977909449 in words is "one billion, nine hundred seventy-seven million, nine hundred nine thousand, four hundred forty-nine".