2040493721 has 6 divisors (see below), whose sum is σ = 2373635610. Its totient is φ = 1748994576.

The previous prime is 2040493709. The next prime is 2040493751. The reversal of 2040493721 is 1273940402.

It can be written as a sum of positive squares in only one way, i.e., 2024010121 + 16483600 = 44989^2 + 4060^2 .

It is not a de Polignac number, because 2040493721 - 2¹⁰ = 2040492697 is a prime.

It is a super-2 number, since 2×2040493721² = 8327229250880851682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2040493751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20821316 + ... + 20821413.

It is an arithmetic number, because the mean of its divisors is an integer number (395605935).

Almost surely, 2^2040493721 is an apocalyptic number.

It is an amenable number.

2040493721 is a deficient number, since it is larger than the sum of its proper divisors (333141889).

2040493721 is an equidigital number, since it uses as much as digits as its factorization.

2040493721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41642743 (or 41642736 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 2040493721 is about 45171.8244152259. The cubic root of 2040493721 is about 1268.3674480419.

The spelling of 2040493721 in words is "two billion, forty million, four hundred ninety-three thousand, seven hundred twenty-one".