1690087388 has 24 divisors (see below), whose sum is σ = 3330614784. Its totient is φ = 743439600.

The previous prime is 1690087381. The next prime is 1690087393. The reversal of 1690087388 is 8837800961.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690087381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618170 + ... + 620897.

It is an arithmetic number, because the mean of its divisors is an integer number (138775616).

Almost surely, 2^1690087388 is an apocalyptic number.

It is an amenable number.

1690087388 is a deficient number, since it is larger than the sum of its proper divisors (1640527396).

1690087388 is a wasteful number, since it uses less digits than its factorization.

1690087388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239113 (or 1239111 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1690087388 is about 41110.6724342962. The cubic root of 1690087388 is about 1191.1589556522.

It can be divided in two parts, 16900873 and 88, that added together give a palindrome (16900961).

The spelling of 1690087388 in words is "one billion, six hundred ninety million, eighty-seven thousand, three hundred eighty-eight".