1405979391 has 12 divisors (see below), whose sum is σ = 1925846232. Its totient is φ = 911730384.

The previous prime is 1405979359. The next prime is 1405979429. The reversal of 1405979391 is 1939795041.

It is not a de Polignac number, because 1405979391 - 2⁵ = 1405979359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1405979391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405979591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393270 + ... + 396828.

It is an arithmetic number, because the mean of its divisors is an integer number (160487186).

Almost surely, 2^1405979391 is an apocalyptic number.

1405979391 is a deficient number, since it is larger than the sum of its proper divisors (519866841).

1405979391 is an frugal number, since it uses more digits than its factorization.

1405979391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158 (or 3599 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 1405979391 is about 37496.3917064029. The cubic root of 1405979391 is about 1120.2793178243.

The spelling of 1405979391 in words is "one billion, four hundred five million, nine hundred seventy-nine thousand, three hundred ninety-one".