1812920025 has 24 divisors (see below), whose sum is σ = 3425556544. Its totient is φ = 828763200.

The previous prime is 1812919993. The next prime is 1812920027. The reversal of 1812920025 is 5200292181.

It is not a de Polignac number, because 1812920025 - 2⁵ = 1812919993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812919974 and 1812920001.

It is not an unprimeable number, because it can be changed into a prime (1812920027) 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, 1726066 + ... + 1727115.

Almost surely, 2^1812920025 is an apocalyptic number.

1812920025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1812920025 is a deficient number, since it is larger than the sum of its proper divisors (1612636519).

1812920025 is a wasteful number, since it uses less digits than its factorization.

1812920025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453201 (or 3453196 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1812920025 is about 42578.3985725156. The cubic root of 1812920025 is about 1219.3439151315.

The spelling of 1812920025 in words is "one billion, eight hundred twelve million, nine hundred twenty thousand, twenty-five".