155420707 has 4 divisors (see below), whose sum is σ = 167376160. Its totient is φ = 143465256.

The previous prime is 155420653. The next prime is 155420747. The reversal of 155420707 is 707024551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155420707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155420747) 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, 5977707 + ... + 5977732.

It is an arithmetic number, because the mean of its divisors is an integer number (41844040).

Almost surely, 2^155420707 is an apocalyptic number.

155420707 is a deficient number, since it is larger than the sum of its proper divisors (11955453).

155420707 is a wasteful number, since it uses less digits than its factorization.

155420707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11955452.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 155420707 is about 12466.7841482878. The cubic root of 155420707 is about 537.6540976594.

The spelling of 155420707 in words is "one hundred fifty-five million, four hundred twenty thousand, seven hundred seven".