155139769 has 8 divisors (see below), whose sum is σ = 164155040. Its totient is φ = 146209536.

The previous prime is 155139767. The next prime is 155139791. The reversal of 155139769 is 967931551.

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 155139769 - 2¹ = 155139767 is a prime.

It is a super-2 number, since 2×155139769² = 48136695850746722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155139767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17487 + ... + 24820.

It is an arithmetic number, because the mean of its divisors is an integer number (20519380).

Almost surely, 2^155139769 is an apocalyptic number.

155139769 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

155139769 is a deficient number, since it is larger than the sum of its proper divisors (9015271).

155139769 is a wasteful number, since it uses less digits than its factorization.

155139769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42519.

The product of its digits is 255150, while the sum is 46.

The square root of 155139769 is about 12455.5115912595. The cubic root of 155139769 is about 537.3299482967.

The spelling of 155139769 in words is "one hundred fifty-five million, one hundred thirty-nine thousand, seven hundred sixty-nine".