1825639905 has 8 divisors (see below), whose sum is σ = 2921023872. Its totient is φ = 973674608.

The previous prime is 1825639901. The next prime is 1825639931. The reversal of 1825639905 is 5099365281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1825639905 - 2² = 1825639901 is a prime.

It is a super-2 number, since 2×1825639905² = 6665922125456818050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1825639901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60854649 + ... + 60854678.

It is an arithmetic number, because the mean of its divisors is an integer number (365127984).

Almost surely, 2^1825639905 is an apocalyptic number.

1825639905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1825639905 is a deficient number, since it is larger than the sum of its proper divisors (1095383967).

1825639905 is a wasteful number, since it uses less digits than its factorization.

1825639905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121709335.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 1825639905 is about 42727.5075917143. The cubic root of 1825639905 is about 1222.1890075899.

The spelling of 1825639905 in words is "one billion, eight hundred twenty-five million, six hundred thirty-nine thousand, nine hundred five".