1897945 has 16 divisors (see below), whose sum is σ = 2625408. Its totient is φ = 1290240.

The previous prime is 1897943. The next prime is 1897949. The reversal of 1897945 is 5497981.

1897945 = T₁₄ + T₁₅ + ... + T₂₂₄.

It is not a de Polignac number, because 1897945 - 2¹ = 1897943 is a prime.

It is a Duffinian number.

Its product of digits (90720) is a multiple of the sum of its prime divisors (480).

1897945 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1897943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7257 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (164088).

2^1897945 is an apocalyptic number.

It is an amenable number.

1897945 is a deficient number, since it is larger than the sum of its proper divisors (727463).

1897945 is a wasteful number, since it uses less digits than its factorization.

1897945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its digits is 90720, while the sum is 43.

The square root of 1897945 is about 1377.6592466935. The cubic root of 1897945 is about 123.8115634232.

The spelling of 1897945 in words is "one million, eight hundred ninety-seven thousand, nine hundred forty-five".