1405981404 has 36 divisors (see below), whose sum is σ = 3563725984. Its totient is φ = 467379072.

The previous prime is 1405981373. The next prime is 1405981411. The reversal of 1405981404 is 4041895041.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1405981404² = 3953567416787622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39997 + ... + 66420.

Almost surely, 2^1405981404 is an apocalyptic number.

It is an amenable number.

1405981404 is an abundant number, since it is smaller than the sum of its proper divisors (2157744580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1405981404 is a wasteful number, since it uses less digits than its factorization.

1405981404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106794 (or 106789 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1405981404 is about 37496.4185489761. The cubic root of 1405981404 is about 1120.2798524744.

The spelling of 1405981404 in words is "one billion, four hundred five million, nine hundred eighty-one thousand, four hundred four".