1423109978 has 8 divisors (see below), whose sum is σ = 2136945972. Its totient is φ = 710794656.

The previous prime is 1423109977. The next prime is 1423110023. The reversal of 1423109978 is 8799013241.

It can be written as a sum of positive squares in 2 ways, for example, as 1400480929 + 22629049 = 37423^2 + 4757^2 .

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 (1423109977) 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, 377825 + ... + 381572.

Almost surely, 2^1423109978 is an apocalyptic number.

1423109978 is a deficient number, since it is larger than the sum of its proper divisors (713835994).

1423109978 is an equidigital number, since it uses as much as digits as its factorization.

1423109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760336.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1423109978 is about 37724.1299170703. The cubic root of 1423109978 is about 1124.8108265948.

The spelling of 1423109978 in words is "one billion, four hundred twenty-three million, one hundred nine thousand, nine hundred seventy-eight".