1401783979 has 4 divisors (see below), whose sum is σ = 1419528160. Its totient is φ = 1384039800.

The previous prime is 1401783931. The next prime is 1401783997. The reversal of 1401783979 is 9793871041.

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

It is a cyclic number.

It is not a de Polignac number, because 1401783979 - 2²³ = 1393395371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1471783979) 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, 8871972 + ... + 8872129.

It is an arithmetic number, because the mean of its divisors is an integer number (354882040).

Almost surely, 2^1401783979 is an apocalyptic number.

1401783979 is a deficient number, since it is larger than the sum of its proper divisors (17744181).

1401783979 is an equidigital number, since it uses as much as digits as its factorization.

1401783979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17744180.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 1401783979 is about 37440.4057002592. The cubic root of 1401783979 is about 1119.1639112445.

The spelling of 1401783979 in words is "one billion, four hundred one million, seven hundred eighty-three thousand, nine hundred seventy-nine".