1423634781 has 8 divisors (see below), whose sum is σ = 1901652064. Its totient is φ = 947353680.

The previous prime is 1423634743. The next prime is 1423634789. The reversal of 1423634781 is 1874363241.

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

It is not a de Polignac number, because 1423634781 - 2¹⁵ = 1423602013 is a prime.

It is a super-2 number, since 2×1423634781² = 4053471979345835922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423634789) 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, 432130 + ... + 435411.

It is an arithmetic number, because the mean of its divisors is an integer number (237706508).

Almost surely, 2^1423634781 is an apocalyptic number.

It is an amenable number.

1423634781 is a deficient number, since it is larger than the sum of its proper divisors (478017283).

1423634781 is an equidigital number, since it uses as much as digits as its factorization.

1423634781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868091.

The product of its digits is 96768, while the sum is 39.

The square root of 1423634781 is about 37731.0850758363. The cubic root of 1423634781 is about 1124.9490758184.

The spelling of 1423634781 in words is "one billion, four hundred twenty-three million, six hundred thirty-four thousand, seven hundred eighty-one".