1938940957 has 8 divisors (see below), whose sum is σ = 2006582400. Its totient is φ = 1871351664.

The previous prime is 1938940919. The next prime is 1938940979. The reversal of 1938940957 is 7590498391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938940957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1938940898 and 1938940907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938940987) 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, 72144 + ... + 95302.

It is an arithmetic number, because the mean of its divisors is an integer number (250822800).

Almost surely, 2^1938940957 is an apocalyptic number.

It is an amenable number.

1938940957 is a deficient number, since it is larger than the sum of its proper divisors (67641443).

1938940957 is a wasteful number, since it uses less digits than its factorization.

1938940957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26075.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 1938940957 is about 44033.4072835614. The cubic root of 1938940957 is about 1246.9667161317.

The spelling of 1938940957 in words is "one billion, nine hundred thirty-eight million, nine hundred forty thousand, nine hundred fifty-seven".