1978346159 has 8 divisors (see below), whose sum is σ = 2003866800. Its totient is φ = 1952989056.

The previous prime is 1978346147. The next prime is 1978346179. The reversal of 1978346159 is 9516438791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978346159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978346159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978346119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16442 + ... + 65015.

It is an arithmetic number, because the mean of its divisors is an integer number (250483350).

Almost surely, 2^1978346159 is an apocalyptic number.

1978346159 is a deficient number, since it is larger than the sum of its proper divisors (25520641).

1978346159 is a wasteful number, since it uses less digits than its factorization.

1978346159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81769.

The product of its digits is 1632960, while the sum is 53.

The square root of 1978346159 is about 44478.6033840992. The cubic root of 1978346159 is about 1255.3575187089.

The spelling of 1978346159 in words is "one billion, nine hundred seventy-eight million, three hundred forty-six thousand, one hundred fifty-nine".