1631472638 has 8 divisors (see below), whose sum is σ = 2455562088. Its totient is φ = 812951944.

The previous prime is 1631472631. The next prime is 1631472649. The reversal of 1631472638 is 8362741361.

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

It is a junction number, because it is equal to n+sod(n) for n = 1631472595 and 1631472604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631472631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391456 + ... + 1392627.

It is an arithmetic number, because the mean of its divisors is an integer number (306945261).

Almost surely, 2^1631472638 is an apocalyptic number.

1631472638 is a deficient number, since it is larger than the sum of its proper divisors (824089450).

1631472638 is a wasteful number, since it uses less digits than its factorization.

1631472638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784378.

The product of its digits is 145152, while the sum is 41.

The square root of 1631472638 is about 40391.4921487186. The cubic root of 1631472638 is about 1177.2262336879.

The spelling of 1631472638 in words is "one billion, six hundred thirty-one million, four hundred seventy-two thousand, six hundred thirty-eight".