634440919 has 8 divisors (see below), whose sum is σ = 728513408. Its totient is φ = 541227960.

The previous prime is 634440871. The next prime is 634440941. The reversal of 634440919 is 919044436.

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

It is not a de Polignac number, because 634440919 - 2¹³ = 634432727 is a prime.

It is a super-2 number, since 2×634440919² = 805030559403129122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634441919) 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, 213297 + ... + 216250.

It is an arithmetic number, because the mean of its divisors is an integer number (91064176).

Almost surely, 2^634440919 is an apocalyptic number.

634440919 is a deficient number, since it is larger than the sum of its proper divisors (94072489).

634440919 is a wasteful number, since it uses less digits than its factorization.

634440919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429765.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 634440919 is about 25188.1106675352. The cubic root of 634440919 is about 859.2714755982.

The spelling of 634440919 in words is "six hundred thirty-four million, four hundred forty thousand, nine hundred nineteen".