690399044 has 12 divisors (see below), whose sum is σ = 1208453568. Its totient is φ = 345126600.

The previous prime is 690399043. The next prime is 690399049. The reversal of 690399044 is 440993096.

It is a happy number.

It is a super-2 number, since 2×690399044² = 953301679912227872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690398986 and 690399004.

It is not an unprimeable number, because it can be changed into a prime (690399043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6929 + ... + 37799.

It is an arithmetic number, because the mean of its divisors is an integer number (100704464).

Almost surely, 2^690399044 is an apocalyptic number.

It is an amenable number.

690399044 is a deficient number, since it is larger than the sum of its proper divisors (518054524).

690399044 is a wasteful number, since it uses less digits than its factorization.

690399044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36466 (or 36464 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 690399044 is about 26275.4456479809. The cubic root of 690399044 is about 883.8259060124.

The spelling of 690399044 in words is "six hundred ninety million, three hundred ninety-nine thousand, forty-four".