1211942390 has 16 divisors (see below), whose sum is σ = 2197193040. Its totient is φ = 481288800.

The previous prime is 1211942387. The next prime is 1211942399. The reversal of 1211942390 is 932491121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211942399) 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, 434561 + ... + 437340.

It is an arithmetic number, because the mean of its divisors is an integer number (137324565).

Almost surely, 2^1211942390 is an apocalyptic number.

1211942390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211942390 is a deficient number, since it is larger than the sum of its proper divisors (985250650).

1211942390 is a wasteful number, since it uses less digits than its factorization.

1211942390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872047.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1211942390 is about 34812.9629592197. The cubic root of 1211942390 is about 1066.1721289348.

The spelling of 1211942390 in words is "one billion, two hundred eleven million, nine hundred forty-two thousand, three hundred ninety".