690347438 has 16 divisors (see below), whose sum is σ = 1178775936. Its totient is φ = 300150840.

The previous prime is 690347429. The next prime is 690347459. The reversal of 690347438 is 834743096.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681656 + ... + 682667.

It is an arithmetic number, because the mean of its divisors is an integer number (73673496).

Almost surely, 2^690347438 is an apocalyptic number.

690347438 is a deficient number, since it is larger than the sum of its proper divisors (488428498).

690347438 is a wasteful number, since it uses less digits than its factorization.

690347438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364359.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 690347438 is about 26274.4636101291. The cubic root of 690347438 is about 883.8038840352.

The spelling of 690347438 in words is "six hundred ninety million, three hundred forty-seven thousand, four hundred thirty-eight".