1690203438 has 192 divisors, whose sum is σ = 4896433152. Its totient is φ = 408291840.

The previous prime is 1690203413. The next prime is 1690203467. The reversal of 1690203438 is 8343020961.

1690203438 is a `hidden beast` number, since 16 + 9 + 0 + 203 + 438 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1178770 + ... + 1180202.

It is an arithmetic number, because the mean of its divisors is an integer number (25502256).

Almost surely, 2^1690203438 is an apocalyptic number.

1690203438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690203438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2448216576).

1690203438 is an abundant number, since it is smaller than the sum of its proper divisors (3206229714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1690203438 is a wasteful number, since it uses less digits than its factorization.

1690203438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1690203438 is about 41112.0838440476. The cubic root of 1690203438 is about 1191.1862187065.

The spelling of 1690203438 in words is "one billion, six hundred ninety million, two hundred three thousand, four hundred thirty-eight".