1992921 has 16 divisors (see below), whose sum is σ = 3108864. Its totient is φ = 1111824.

The previous prime is 1992919. The next prime is 1992937. The reversal of 1992921 is 1292991.

It is not a de Polignac number, because 1992921 - 2¹ = 1992919 is a prime.

It is a super-2 number, since 2×1992921² = 7943468224482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1992911) 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, 201 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (194304).

2^1992921 is an apocalyptic number.

It is an amenable number.

1992921 is a deficient number, since it is larger than the sum of its proper divisors (1115943).

1992921 is a wasteful number, since it uses less digits than its factorization.

1992921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260.

The product of its digits is 2916, while the sum is 33.

The square root of 1992921 is about 1411.7085393239. The cubic root of 1992921 is about 125.8432795767.

The spelling of 1992921 in words is "one million, nine hundred ninety-two thousand, nine hundred twenty-one".