47378423138 has 6 divisors (see below), whose sum is σ = 71068096449. Its totient is φ = 23689057656.

The previous prime is 47378423117. The next prime is 47378423159. The reversal of 47378423138 is 83132487374.

It is an interprime number because it is at equal distance from previous prime (47378423117) and next prime (47378423159).

It can be written as a sum of positive squares in 2 ways, for example, as 34411363009 + 12967060129 = 185503^2 + 113873^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=153913.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 230870 + ... + 384782.

Almost surely, 2^47378423138 is an apocalyptic number.

47378423138 is a deficient number, since it is larger than the sum of its proper divisors (23689673311).

47378423138 is an frugal number, since it uses more digits than its factorization.

47378423138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307828 (or 153915 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 50.

Multiplying 47378423138 by its sum of digits (50), we get a square (2368921156900 = 1539130²).

The spelling of 47378423138 in words is "forty-seven billion, three hundred seventy-eight million, four hundred twenty-three thousand, one hundred thirty-eight".