1689949420 has 24 divisors (see below), whose sum is σ = 3558794400. Its totient is φ = 674093952.

The previous prime is 1689949409. The next prime is 1689949441. The reversal of 1689949420 is 249499861.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110505 + ... + 124864.

It is an arithmetic number, because the mean of its divisors is an integer number (148283100).

Almost surely, 2^1689949420 is an apocalyptic number.

1689949420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689949420 is an abundant number, since it is smaller than the sum of its proper divisors (1868844980).

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

1689949420 is a wasteful number, since it uses less digits than its factorization.

1689949420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235737 (or 235735 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1689949420 is about 41108.9943929549. The cubic root of 1689949420 is about 1191.1265418863.

The spelling of 1689949420 in words is "one billion, six hundred eighty-nine million, nine hundred forty-nine thousand, four hundred twenty".