1691228390 has 16 divisors (see below), whose sum is σ = 3046734432. Its totient is φ = 675930624.

The previous prime is 1691228377. The next prime is 1691228417. The reversal of 1691228390 is 938221961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57314 + ... + 81653.

It is an arithmetic number, because the mean of its divisors is an integer number (190420902).

Almost surely, 2^1691228390 is an apocalyptic number.

1691228390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691228390 is a deficient number, since it is larger than the sum of its proper divisors (1355506042).

1691228390 is a wasteful number, since it uses less digits than its factorization.

1691228390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140191.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1691228390 is about 41124.5472923411. The cubic root of 1691228390 is about 1191.4269514616.

The spelling of 1691228390 in words is "one billion, six hundred ninety-one million, two hundred twenty-eight thousand, three hundred ninety".