1890207645 has 16 divisors (see below), whose sum is σ = 3202234560. Its totient is φ = 948809984.

The previous prime is 1890207629. The next prime is 1890207659. The reversal of 1890207645 is 5467020981.

It is not a de Polignac number, because 1890207645 - 2⁴ = 1890207629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1890207597 and 1890207606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3706035 + ... + 3706544.

It is an arithmetic number, because the mean of its divisors is an integer number (200139660).

Almost surely, 2^1890207645 is an apocalyptic number.

1890207645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1890207645 is a deficient number, since it is larger than the sum of its proper divisors (1312026915).

1890207645 is a wasteful number, since it uses less digits than its factorization.

1890207645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7412604.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1890207645 is about 43476.5183173630. The cubic root of 1890207645 is about 1236.4308668181.

The spelling of 1890207645 in words is "one billion, eight hundred ninety million, two hundred seven thousand, six hundred forty-five".