1978380849 has 16 divisors (see below), whose sum is σ = 2687053824. Its totient is φ = 1294482000.

The previous prime is 1978380827. The next prime is 1978380869. The reversal of 1978380849 is 9480838791.

It is not a de Polignac number, because 1978380849 - 2⁹ = 1978380337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978380869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26674 + ... + 68324.

It is an arithmetic number, because the mean of its divisors is an integer number (167940864).

Almost surely, 2^1978380849 is an apocalyptic number.

It is an amenable number.

1978380849 is a deficient number, since it is larger than the sum of its proper divisors (708672975).

1978380849 is a wasteful number, since it uses less digits than its factorization.

1978380849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41948.

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 1978380849 is about 44478.9933451736. The cubic root of 1978380849 is about 1255.3648561673.

The spelling of 1978380849 in words is "one billion, nine hundred seventy-eight million, three hundred eighty thousand, eight hundred forty-nine".