1917838245 has 16 divisors (see below), whose sum is σ = 3230043840. Its totient is φ = 969012864.

The previous prime is 1917838211. The next prime is 1917838249. The reversal of 1917838245 is 5428387191.

It is not a de Polignac number, because 1917838245 - 2⁸ = 1917837989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1917838194 and 1917838203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1917838249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3364344 + ... + 3364913.

It is an arithmetic number, because the mean of its divisors is an integer number (201877740).

Almost surely, 2^1917838245 is an apocalyptic number.

1917838245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1917838245 is a deficient number, since it is larger than the sum of its proper divisors (1312205595).

1917838245 is a wasteful number, since it uses less digits than its factorization.

1917838245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729284.

The product of its digits is 483840, while the sum is 48.

The square root of 1917838245 is about 43793.1301119251. The cubic root of 1917838245 is about 1242.4263636361.

It can be divided in two parts, 191783 and 8245, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 1917838245 in words is "one billion, nine hundred seventeen million, eight hundred thirty-eight thousand, two hundred forty-five".