138547970 has 16 divisors (see below), whose sum is σ = 272058048. Its totient is φ = 50381040.

The previous prime is 138547957. The next prime is 138547973. The reversal of 138547970 is 79745831.

It is a super-2 number, since 2×138547970² = 38391079982241800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138547973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629654 + ... + 629873.

It is an arithmetic number, because the mean of its divisors is an integer number (17003628).

Almost surely, 2^138547970 is an apocalyptic number.

138547970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138547970 is a deficient number, since it is larger than the sum of its proper divisors (133510078).

138547970 is a wasteful number, since it uses less digits than its factorization.

138547970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259545.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 138547970 is about 11770.6401695065. The cubic root of 138547970 is about 517.4480114561.

The spelling of 138547970 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred seventy".