1978233534 has 48 divisors (see below), whose sum is σ = 4329461760. Its totient is φ = 652775760.

The previous prime is 1978233493. The next prime is 1978233541. The reversal of 1978233534 is 4353328791.

1978233534 is a `hidden beast` number, since 1 + 9 + 7 + 82 + 33 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1978233534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1688769 + ... + 1689939.

It is an arithmetic number, because the mean of its divisors is an integer number (90197120).

Almost surely, 2^1978233534 is an apocalyptic number.

1978233534 is an abundant number, since it is smaller than the sum of its proper divisors (2351228226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978233534 is a wasteful number, since it uses less digits than its factorization.

1978233534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045 (or 2042 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 1978233534 is about 44477.3373078920. The cubic root of 1978233534 is about 1255.3336962309. Note that the first 3 decimals are identical.

The spelling of 1978233534 in words is "one billion, nine hundred seventy-eight million, two hundred thirty-three thousand, five hundred thirty-four".