3651838 has 16 divisors (see below), whose sum is σ = 6106320. Its totient is φ = 1627776.

The previous prime is 3651811. The next prime is 3651839. The reversal of 3651838 is 8381563.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181 + ... + 3472.

It is an arithmetic number, because the mean of its divisors is an integer number (381645).

Almost surely, 2^3651838 is an apocalyptic number.

3651838 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3651838 is a deficient number, since it is larger than the sum of its proper divisors (2454482).

3651838 is a wasteful number, since it uses less digits than its factorization.

3651838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691.

The product of its digits is 17280, while the sum is 34.

The square root of 3651838 is about 1910.9782834977. The cubic root of 3651838 is about 153.9940122482.

It can be divided in two parts, 36518 and 38, that multiplied together give a square (1387684 = 1178²).

The spelling of 3651838 in words is "three million, six hundred fifty-one thousand, eight hundred thirty-eight".