1349972978 has 8 divisors (see below), whose sum is σ = 2037857772. Its totient is φ = 670687056.

The previous prime is 1349972977. The next prime is 1349972993. The reversal of 1349972978 is 8792799431.

It can be written as a sum of positive squares in 2 ways, for example, as 1231097569 + 118875409 = 35087^2 + 10903^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1349972977) 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, 2149325 + ... + 2149952.

Almost surely, 2^1349972978 is an apocalyptic number.

1349972978 is a deficient number, since it is larger than the sum of its proper divisors (687884794).

1349972978 is a wasteful number, since it uses less digits than its factorization.

1349972978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299436.

The product of its digits is 6858432, while the sum is 59.

The square root of 1349972978 is about 36741.9784170640. The cubic root of 1349972978 is about 1105.2020754763.

The spelling of 1349972978 in words is "one billion, three hundred forty-nine million, nine hundred seventy-two thousand, nine hundred seventy-eight".