1978512427 has 4 divisors (see below), whose sum is σ = 2082644680. Its totient is φ = 1874380176.

The previous prime is 1978512407. The next prime is 1978512439. The reversal of 1978512427 is 7242158791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978512427 - 2¹¹ = 1978510379 is a prime.

It is a super-2 number, since 2×1978512427² = 7829022847586860658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978512407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52066098 + ... + 52066135.

It is an arithmetic number, because the mean of its divisors is an integer number (520661170).

Almost surely, 2^1978512427 is an apocalyptic number.

1978512427 is a deficient number, since it is larger than the sum of its proper divisors (104132253).

1978512427 is a wasteful number, since it uses less digits than its factorization.

1978512427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104132252.

The product of its digits is 282240, while the sum is 46.

The square root of 1978512427 is about 44480.4724233005. The cubic root of 1978512427 is about 1255.3926861198.

The spelling of 1978512427 in words is "one billion, nine hundred seventy-eight million, five hundred twelve thousand, four hundred twenty-seven".