3634781 has 4 divisors (see below), whose sum is σ = 3752064. Its totient is φ = 3517500.

The previous prime is 3634777. The next prime is 3634789. The reversal of 3634781 is 1874363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1874363 = 151 ⋅12413.

It is a cyclic number.

It is not a de Polignac number, because 3634781 - 2² = 3634777 is a prime.

It is a super-2 number, since 2×3634781² = 26423265835922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3634789) 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, 58595 + ... + 58656.

It is an arithmetic number, because the mean of its divisors is an integer number (938016).

Almost surely, 2^3634781 is an apocalyptic number.

3634781 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3634781 is a deficient number, since it is larger than the sum of its proper divisors (117283).

3634781 is a wasteful number, since it uses less digits than its factorization.

3634781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117282.

The product of its digits is 12096, while the sum is 32.

The square root of 3634781 is about 1906.5101625745. The cubic root of 3634781 is about 153.7538796474.

The spelling of 3634781 in words is "three million, six hundred thirty-four thousand, seven hundred eighty-one".