1918013690 has 32 divisors (see below), whose sum is σ = 3531700224. Its totient is φ = 749770560.

The previous prime is 1918013663. The next prime is 1918013693. The reversal of 1918013690 is 963108191.

It is a super-2 number, since 2×1918013690² = 7357553030054832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1918013693) 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, 73820 + ... + 96360.

It is an arithmetic number, because the mean of its divisors is an integer number (110365632).

Almost surely, 2^1918013690 is an apocalyptic number.

1918013690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918013690 is a deficient number, since it is larger than the sum of its proper divisors (1613686534).

1918013690 is a wasteful number, since it uses less digits than its factorization.

1918013690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22742.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1918013690 is about 43795.1331771009. The cubic root of 1918013690 is about 1242.4642484521.

The spelling of 1918013690 in words is "one billion, nine hundred eighteen million, thirteen thousand, six hundred ninety".