1921814297 has 16 divisors (see below), whose sum is σ = 2112848640. Its totient is φ = 1737288000.

The previous prime is 1921814227. The next prime is 1921814359. The reversal of 1921814297 is 7924181291.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1921814297 - 2²² = 1917619993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921814227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132479 + ... + 146267.

It is an arithmetic number, because the mean of its divisors is an integer number (132053040).

Almost surely, 2^1921814297 is an apocalyptic number.

It is an amenable number.

1921814297 is a deficient number, since it is larger than the sum of its proper divisors (191034343).

1921814297 is a wasteful number, since it uses less digits than its factorization.

1921814297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14024.

The product of its digits is 72576, while the sum is 44.

The square root of 1921814297 is about 43838.5024493310. The cubic root of 1921814297 is about 1243.2843682046.

The spelling of 1921814297 in words is "one billion, nine hundred twenty-one million, eight hundred fourteen thousand, two hundred ninety-seven".