2138154990 has 32 divisors (see below), whose sum is σ = 5168499840. Its totient is φ = 566071584.

The previous prime is 2138154979. The next prime is 2138155037. The reversal of 2138154990 is 994518312.

It is a super-2 number, since 2×2138154990² = 9143413522523800200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252204 + ... + 260543.

It is an arithmetic number, because the mean of its divisors is an integer number (161515620).

Almost surely, 2^2138154990 is an apocalyptic number.

2138154990 is an abundant number, since it is smaller than the sum of its proper divisors (3030344850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138154990 is a wasteful number, since it uses less digits than its factorization.

2138154990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512896.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 2138154990 is about 46240.1880402751. The cubic root of 2138154990 is about 1288.2882952093.

The spelling of 2138154990 in words is "two billion, one hundred thirty-eight million, one hundred fifty-four thousand, nine hundred ninety".