138531950 has 12 divisors (see below), whose sum is σ = 257669520. Its totient is φ = 55412760.

The previous prime is 138531931. The next prime is 138531977. The reversal of 138531950 is 59135831.

It is a super-2 number, since 2×138531950² = 38382202341605000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138531950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1385270 + ... + 1385369.

It is an arithmetic number, because the mean of its divisors is an integer number (21472460).

Almost surely, 2^138531950 is an apocalyptic number.

138531950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138531950 is a deficient number, since it is larger than the sum of its proper divisors (119137570).

138531950 is a wasteful number, since it uses less digits than its factorization.

138531950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770651 (or 2770646 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 138531950 is about 11769.9596430914. The cubic root of 138531950 is about 517.4280668918.

The spelling of 138531950 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, nine hundred fifty".