689401946 has 4 divisors (see below), whose sum is σ = 1034102922. Its totient is φ = 344700972.

The previous prime is 689401939. The next prime is 689401957. The reversal of 689401946 is 649104986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 366301321 + 323100625 = 19139^2 + 17975^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 689401946.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172350485 + ... + 172350488.

Almost surely, 2^689401946 is an apocalyptic number.

689401946 is a deficient number, since it is larger than the sum of its proper divisors (344700976).

689401946 is a wasteful number, since it uses less digits than its factorization.

689401946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344700975.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 689401946 is about 26256.4648420156. The cubic root of 689401946 is about 883.4002171104.

The spelling of 689401946 in words is "six hundred eighty-nine million, four hundred one thousand, nine hundred forty-six".