1689902040 has 64 divisors (see below), whose sum is σ = 5072428800. Its totient is φ = 450398592.

The previous prime is 1689901937. The next prime is 1689902041. The reversal of 1689902040 is 402099861.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1689902040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689902041) 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, 396159 + ... + 400401.

It is an arithmetic number, because the mean of its divisors is an integer number (79256700).

Almost surely, 2^1689902040 is an apocalyptic number.

1689902040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689902040 is an abundant number, since it is smaller than the sum of its proper divisors (3382526760).

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

1689902040 is a wasteful number, since it uses less digits than its factorization.

1689902040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576 (or 7572 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1689902040 is about 41108.4181160015. The cubic root of 1689902040 is about 1191.1154101718.

The spelling of 1689902040 in words is "one billion, six hundred eighty-nine million, nine hundred two thousand, forty".