34623781 has 4 divisors (see below), whose sum is σ = 36660492. Its totient is φ = 32587072.

The previous prime is 34623769. The next prime is 34623817. The reversal of 34623781 is 18732643.

It is a happy number.

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 12852225 + 21771556 = 3585^2 + 4666^2 .

It is a cyclic number.

It is not a de Polignac number, because 34623781 - 2²⁵ = 1069349 is a prime.

It is a super-2 number, since 2×34623781² = 2397612421471922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34623731) 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, 1018330 + ... + 1018363.

It is an arithmetic number, because the mean of its divisors is an integer number (9165123).

Almost surely, 2^34623781 is an apocalyptic number.

It is an amenable number.

34623781 is a deficient number, since it is larger than the sum of its proper divisors (2036711).

34623781 is a wasteful number, since it uses less digits than its factorization.

34623781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036710.

The product of its digits is 24192, while the sum is 34.

The square root of 34623781 is about 5884.1975663637. The cubic root of 34623781 is about 325.9303707917.

The spelling of 34623781 in words is "thirty-four million, six hundred twenty-three thousand, seven hundred eighty-one".