1906431630 has 32 divisors (see below), whose sum is σ = 4595089824. Its totient is φ = 506198016.

The previous prime is 1906431599. The next prime is 1906431647. The reversal of 1906431630 is 361346091.

It is a junction number, because it is equal to n+sod(n) for n = 1906431591 and 1906431600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129379 + ... + 143358.

It is an arithmetic number, because the mean of its divisors is an integer number (143596557).

Almost surely, 2^1906431630 is an apocalyptic number.

1906431630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1906431630 is an abundant number, since it is smaller than the sum of its proper divisors (2688658194).

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

1906431630 is a wasteful number, since it uses less digits than its factorization.

1906431630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272980.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 1906431630 is about 43662.7029625973. The cubic root of 1906431630 is about 1239.9582950767.

The spelling of 1906431630 in words is "one billion, nine hundred six million, four hundred thirty-one thousand, six hundred thirty".