1900545 has 8 divisors (see below), whose sum is σ = 3040896. Its totient is φ = 1013616.

The previous prime is 1900543. The next prime is 1900553. The reversal of 1900545 is 5450091.

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

It is not a de Polignac number, because 1900545 - 2¹ = 1900543 is a prime.

It is a super-2 number, since 2×1900545² = 7224142594050, which contains 22 as substring.

1900545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1900541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63337 + ... + 63366.

It is an arithmetic number, because the mean of its divisors is an integer number (380112).

It is a Proth number, since it is equal to 29 ⋅ 2¹⁶ + 1 and 29 < 2¹⁶.

2^1900545 is an apocalyptic number.

1900545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1900545 is a deficient number, since it is larger than the sum of its proper divisors (1140351).

1900545 is a wasteful number, since it uses less digits than its factorization.

1900545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126711.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1900545 is about 1378.6025533126. The cubic root of 1900545 is about 123.8680742251.

The spelling of 1900545 in words is "one million, nine hundred thousand, five hundred forty-five".