1978427133 has 16 divisors (see below), whose sum is σ = 3058439040. Its totient is φ = 1261605312.

The previous prime is 1978427039. The next prime is 1978427137. The reversal of 1978427133 is 3317248791.

1978427133 is a `hidden beast` number, since 1 + 97 + 8 + 427 + 133 = 666.

It is not a de Polignac number, because 1978427133 - 2¹³ = 1978418941 is a prime.

It is a super-3 number, since 3×1978427133³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978427137) 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, 1592316 + ... + 1593557.

It is an arithmetic number, because the mean of its divisors is an integer number (191152440).

Almost surely, 2^1978427133 is an apocalyptic number.

It is an amenable number.

1978427133 is a deficient number, since it is larger than the sum of its proper divisors (1080011907).

1978427133 is a wasteful number, since it uses less digits than its factorization.

1978427133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185905 (or 3185899 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 1978427133 is about 44479.5136326826. The cubic root of 1978427133 is about 1255.3746457980.

The spelling of 1978427133 in words is "one billion, nine hundred seventy-eight million, four hundred twenty-seven thousand, one hundred thirty-three".