1977994241 has 4 divisors (see below), whose sum is σ = 1978863684. Its totient is φ = 1977124800.

The previous prime is 1977994231. The next prime is 1977994253. The reversal of 1977994241 is 1424997791.

It is a happy number.

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 1728480625 + 249513616 = 41575^2 + 15796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977994241 - 2⁶ = 1977994177 is a prime.

It is a super-2 number, since 2×1977994241² = 7824922434858332162, which contains 22 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 (1977994231) 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, 431300 + ... + 435861.

It is an arithmetic number, because the mean of its divisors is an integer number (494715921).

Almost surely, 2^1977994241 is an apocalyptic number.

It is an amenable number.

1977994241 is a deficient number, since it is larger than the sum of its proper divisors (869443).

1977994241 is an equidigital number, since it uses as much as digits as its factorization.

1977994241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869442.

The product of its digits is 1143072, while the sum is 53.

The square root of 1977994241 is about 44474.6471711693. The cubic root of 1977994241 is about 1255.2830778932.

The spelling of 1977994241 in words is "one billion, nine hundred seventy-seven million, nine hundred ninety-four thousand, two hundred forty-one".