1799953978 has 8 divisors (see below), whose sum is σ = 2730267540. Its totient is φ = 889864800.

The previous prime is 1799953973. The next prime is 1799954003. The reversal of 1799953978 is 8793599971.

It can be written as a sum of positive squares in 2 ways, for example, as 1799710929 + 243049 = 42423^2 + 493^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1799953973) 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, 5055873 + ... + 5056228.

Almost surely, 2^1799953978 is an apocalyptic number.

1799953978 is a deficient number, since it is larger than the sum of its proper divisors (930313562).

1799953978 is a wasteful number, since it uses less digits than its factorization.

1799953978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112192.

The product of its digits is 38578680, while the sum is 67.

The square root of 1799953978 is about 42425.8644932546. The cubic root of 1799953978 is about 1216.4300318004.

The spelling of 1799953978 in words is "one billion, seven hundred ninety-nine million, nine hundred fifty-three thousand, nine hundred seventy-eight".