156422729 has 4 divisors (see below), whose sum is σ = 165624084. Its totient is φ = 147221376.

The previous prime is 156422671. The next prime is 156422759. The reversal of 156422729 is 927224651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927224651 = 5987 ⋅154873.

It can be written as a sum of positive squares in 2 ways, for example, as 67158025 + 89264704 = 8195^2 + 9448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156422729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156422692 and 156422701.

It is not an unprimeable number, because it can be changed into a prime (156422759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4600652 + ... + 4600685.

It is an arithmetic number, because the mean of its divisors is an integer number (41406021).

Almost surely, 2^156422729 is an apocalyptic number.

It is an amenable number.

156422729 is a deficient number, since it is larger than the sum of its proper divisors (9201355).

156422729 is an equidigital number, since it uses as much as digits as its factorization.

156422729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201354.

The product of its digits is 60480, while the sum is 38.

The square root of 156422729 is about 12506.9072515950. The cubic root of 156422729 is about 538.8070705383.

The spelling of 156422729 in words is "one hundred fifty-six million, four hundred twenty-two thousand, seven hundred twenty-nine".