1978579634 has 8 divisors (see below), whose sum is σ = 2980184988. Its totient is φ = 985184640.

The previous prime is 1978579571. The next prime is 1978579643. The reversal of 1978579634 is 4369758791.

It can be written as a sum of positive squares in 2 ways, for example, as 1971804025 + 6775609 = 44405^2 + 2603^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051987 + ... + 2052950.

Almost surely, 2^1978579634 is an apocalyptic number.

1978579634 is a deficient number, since it is larger than the sum of its proper divisors (1001605354).

1978579634 is a wasteful number, since it uses less digits than its factorization.

1978579634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105180.

The product of its digits is 11430720, while the sum is 59.

The square root of 1978579634 is about 44481.2278832318. The cubic root of 1978579634 is about 1255.4069005400.

The spelling of 1978579634 in words is "one billion, nine hundred seventy-eight million, five hundred seventy-nine thousand, six hundred thirty-four".