1978433701 has 4 divisors (see below), whose sum is σ = 2094812172. Its totient is φ = 1862055232.

The previous prime is 1978433683. The next prime is 1978433707. The reversal of 1978433701 is 1073348791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1513988100 + 464445601 = 38910^2 + 21551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978433701 - 2¹⁵ = 1978400933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978433707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58189210 + ... + 58189243.

It is an arithmetic number, because the mean of its divisors is an integer number (523703043).

Almost surely, 2^1978433701 is an apocalyptic number.

It is an amenable number.

1978433701 is a deficient number, since it is larger than the sum of its proper divisors (116378471).

1978433701 is a wasteful number, since it uses less digits than its factorization.

1978433701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116378470.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 1978433701 is about 44479.5874643639. The cubic root of 1978433701 is about 1255.3760349978.

The spelling of 1978433701 in words is "one billion, nine hundred seventy-eight million, four hundred thirty-three thousand, seven hundred one".