157440069 has 12 divisors (see below), whose sum is σ = 233560236. Its totient is φ = 102123072.

The previous prime is 157440029. The next prime is 157440079. The reversal of 157440069 is 960044751.

157440069 is a `hidden beast` number, since 157 + 440 + 0 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 133056225 + 24383844 = 11535^2 + 4938^2 .

It is not a de Polignac number, because 157440069 - 2¹² = 157435973 is a prime.

It is a super-2 number, since 2×157440069² = 49574750653449522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157440029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236064 + ... + 236729.

It is an arithmetic number, because the mean of its divisors is an integer number (19463353).

Almost surely, 2^157440069 is an apocalyptic number.

It is an amenable number.

157440069 is a deficient number, since it is larger than the sum of its proper divisors (76120167).

157440069 is a wasteful number, since it uses less digits than its factorization.

157440069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472836 (or 472833 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 157440069 is about 12547.5124626358. The cubic root of 157440069 is about 539.9726426470.

The spelling of 157440069 in words is "one hundred fifty-seven million, four hundred forty thousand, sixty-nine".