690894146 has 4 divisors (see below), whose sum is σ = 1036341222. Its totient is φ = 345447072.

The previous prime is 690894143. The next prime is 690894181. The reversal of 690894146 is 641498096.

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., 406465921 + 284428225 = 20161^2 + 16865^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 690894146.

It is not an unprimeable number, because it can be changed into a prime (690894143) 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 as a sum of consecutive naturals, namely, 172723535 + ... + 172723538.

Almost surely, 2^690894146 is an apocalyptic number.

690894146 is a deficient number, since it is larger than the sum of its proper divisors (345447076).

690894146 is a wasteful number, since it uses less digits than its factorization.

690894146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345447075.

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

The square root of 690894146 is about 26284.8653411046. The cubic root of 690894146 is about 884.0371265708.

The spelling of 690894146 in words is "six hundred ninety million, eight hundred ninety-four thousand, one hundred forty-six".