1689940434 has 64 divisors (see below), whose sum is σ = 4164620544. Its totient is φ = 445188096.

The previous prime is 1689940423. The next prime is 1689940459. The reversal of 1689940434 is 4340499861.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 846942 + ... + 848934.

It is an arithmetic number, because the mean of its divisors is an integer number (65072196).

Almost surely, 2^1689940434 is an apocalyptic number.

1689940434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1689940434 is an abundant number, since it is smaller than the sum of its proper divisors (2474680110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689940434 is a wasteful number, since it uses less digits than its factorization.

1689940434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 1689940434 is about 41108.8850979931. The cubic root of 1689940434 is about 1191.1244306826.

The spelling of 1689940434 in words is "one billion, six hundred eighty-nine million, nine hundred forty thousand, four hundred thirty-four".