155440534 has 4 divisors (see below), whose sum is σ = 233160804. Its totient is φ = 77720266.

The previous prime is 155440531. The next prime is 155440559. The reversal of 155440534 is 435044551.

It is a happy number.

155440534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×155440534² = 48323519220410312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155440496 and 155440505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155440531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38860132 + ... + 38860135.

It is an arithmetic number, because the mean of its divisors is an integer number (58290201).

Almost surely, 2^155440534 is an apocalyptic number.

155440534 is a deficient number, since it is larger than the sum of its proper divisors (77720270).

155440534 is an equidigital number, since it uses as much as digits as its factorization.

155440534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77720269.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 155440534 is about 12467.5793159699. The cubic root of 155440534 is about 537.6769595091.

The spelling of 155440534 in words is "one hundred fifty-five million, four hundred forty thousand, five hundred thirty-four".