1405644979 has 4 divisors (see below), whose sum is σ = 1406240200. Its totient is φ = 1405049760.

The previous prime is 1405644971. The next prime is 1405645001. The reversal of 1405644979 is 9794465041.

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 1405644979 - 2³ = 1405644971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405644971) 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, 294054 + ... + 298795.

It is an arithmetic number, because the mean of its divisors is an integer number (351560050).

Almost surely, 2^1405644979 is an apocalyptic number.

1405644979 is a deficient number, since it is larger than the sum of its proper divisors (595221).

1405644979 is an equidigital number, since it uses as much as digits as its factorization.

1405644979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595220.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 1405644979 is about 37491.9321854716. The cubic root of 1405644979 is about 1120.1904913555.

The spelling of 1405644979 in words is "one billion, four hundred five million, six hundred forty-four thousand, nine hundred seventy-nine".