1901945 has 8 divisors (see below), whose sum is σ = 2310336. Its totient is φ = 1502896.

The previous prime is 1901923. The next prime is 1901947. The reversal of 1901945 is 5491091.

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 1901945 - 2¹⁴ = 1885561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1877 + ... + 2706.

It is an arithmetic number, because the mean of its divisors is an integer number (288792).

2^1901945 is an apocalyptic number.

It is an amenable number.

1901945 is a deficient number, since it is larger than the sum of its proper divisors (408391).

1901945 is an equidigital number, since it uses as much as digits as its factorization.

1901945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1901945 is about 1379.1102203957. The cubic root of 1901945 is about 123.8984817732.

The spelling of 1901945 in words is "one million, nine hundred one thousand, nine hundred forty-five".