1902281 has 4 divisors (see below), whose sum is σ = 1953732. Its totient is φ = 1850832.

The previous prime is 1902269. The next prime is 1902287. The reversal of 1902281 is 1822091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1229881 + 672400 = 1109^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902281 - 2⁶ = 1902217 is a prime.

It is a super-2 number, since 2×1902281² = 7237346005922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1902287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25670 + ... + 25743.

It is an arithmetic number, because the mean of its divisors is an integer number (488433).

2^1902281 is an apocalyptic number.

It is an amenable number.

1902281 is a deficient number, since it is larger than the sum of its proper divisors (51451).

1902281 is an equidigital number, since it uses as much as digits as its factorization.

1902281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51450.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1902281 is about 1379.2320326907. The cubic root of 1902281 is about 123.9057773642.

The spelling of 1902281 in words is "one million, nine hundred two thousand, two hundred eighty-one".