1291921404 has 48 divisors (see below), whose sum is σ = 3118295040. Its totient is φ = 415869120.

The previous prime is 1291921381. The next prime is 1291921417. The reversal of 1291921404 is 4041291921.

It is a super-2 number, since 2×1291921404² = 3338121828226662432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185937 + ... + 192759.

It is an arithmetic number, because the mean of its divisors is an integer number (64964480).

Almost surely, 2^1291921404 is an apocalyptic number.

It is an amenable number.

1291921404 is an abundant number, since it is smaller than the sum of its proper divisors (1826373636).

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

1291921404 is a wasteful number, since it uses less digits than its factorization.

1291921404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7370 (or 7368 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1291921404 is about 35943.3081949895. The cubic root of 1291921404 is about 1089.1274345546.

The spelling of 1291921404 in words is "one billion, two hundred ninety-one million, nine hundred twenty-one thousand, four hundred four".