156405457 has 8 divisors (see below), whose sum is σ = 178344936. Its totient is φ = 135881472.

The previous prime is 156405421. The next prime is 156405461. The reversal of 156405457 is 754504651.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29257281 + 127148176 = 5409^2 + 11276^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 156405457 - 2⁷ = 156405329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156405467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353638 + ... + 354079.

It is an arithmetic number, because the mean of its divisors is an integer number (22293117).

Almost surely, 2^156405457 is an apocalyptic number.

156405457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

156405457 is a deficient number, since it is larger than the sum of its proper divisors (21939479).

156405457 is a wasteful number, since it uses less digits than its factorization.

156405457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707747.

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 156405457 is about 12506.2167340887. The cubic root of 156405457 is about 538.7872383431.

The spelling of 156405457 in words is "one hundred fifty-six million, four hundred five thousand, four hundred fifty-seven".