1721040825 has 24 divisors (see below), whose sum is σ = 3251948608. Its totient is φ = 786761280.

The previous prime is 1721040823. The next prime is 1721040851. The reversal of 1721040825 is 5280401271.

It is not a de Polignac number, because 1721040825 - 2¹ = 1721040823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1721040792 and 1721040801.

It is not an unprimeable number, because it can be changed into a prime (1721040823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1638562 + ... + 1639611.

Almost surely, 2^1721040825 is an apocalyptic number.

1721040825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1721040825 is a deficient number, since it is larger than the sum of its proper divisors (1530907783).

1721040825 is a wasteful number, since it uses less digits than its factorization.

1721040825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278193 (or 3278188 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 1721040825 is about 41485.4290685296. The cubic root of 1721040825 is about 1198.3869124565.

The spelling of 1721040825 in words is "one billion, seven hundred twenty-one million, forty thousand, eight hundred twenty-five".