1690222012 has 24 divisors (see below), whose sum is σ = 3041986640. Its totient is φ = 821145600.

The previous prime is 1690221997. The next prime is 1690222013. The reversal of 1690222012 is 2102220961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690222013) 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, 106387 + ... + 121237.

Almost surely, 2^1690222012 is an apocalyptic number.

It is an amenable number.

1690222012 is a deficient number, since it is larger than the sum of its proper divisors (1351764628).

1690222012 is a wasteful number, since it uses less digits than its factorization.

1690222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15661 (or 15659 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1690222012 is about 41112.3097380821. The cubic root of 1690222012 is about 1191.1905820889.

Adding to 1690222012 its reverse (2102220961), we get a palindrome (3792442973).

The spelling of 1690222012 in words is "one billion, six hundred ninety million, two hundred twenty-two thousand, twelve".