1901636 has 18 divisors (see below), whose sum is σ = 3658830. Its totient is φ = 864160.

The previous prime is 1901597. The next prime is 1901639. The reversal of 1901636 is 6361091.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 592900 = 1144^2 + 770^2 .

It is not an unprimeable number, because it can be changed into a prime (1901639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1481 + ... + 2448.

2^1901636 is an apocalyptic number.

It is an amenable number.

1901636 is a deficient number, since it is larger than the sum of its proper divisors (1757194).

1901636 is a wasteful number, since it uses less digits than its factorization.

1901636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1901636 is about 1378.9981870909. The cubic root of 1901636 is about 123.8917716765.

The spelling of 1901636 in words is "one million, nine hundred one thousand, six hundred thirty-six".