1634938381 has 8 divisors (see below), whose sum is σ = 1673176320. Its totient is φ = 1596844368.

The previous prime is 1634938373. The next prime is 1634938453. The reversal of 1634938381 is 1838394361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1634938381 - 2³ = 1634938373 is a prime.

It is a super-2 number, since 2×1634938381² = 5346047019333802322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634938301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12826 + ... + 58603.

It is an arithmetic number, because the mean of its divisors is an integer number (209147040).

Almost surely, 2^1634938381 is an apocalyptic number.

It is an amenable number.

1634938381 is a deficient number, since it is larger than the sum of its proper divisors (38237939).

1634938381 is an equidigital number, since it uses as much as digits as its factorization.

1634938381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71963.

The product of its digits is 373248, while the sum is 46.

The square root of 1634938381 is about 40434.3712823632. The cubic root of 1634938381 is about 1178.0592393748.

The spelling of 1634938381 in words is "one billion, six hundred thirty-four million, nine hundred thirty-eight thousand, three hundred eighty-one".