3971505990 has 16 divisors (see below), whose sum is σ = 9531614448. Its totient is φ = 1059068256.

The previous prime is 3971505931. The next prime is 3971506001. The reversal of 3971505990 is 995051793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66191737 + ... + 66191796.

It is an arithmetic number, because the mean of its divisors is an integer number (595725903).

Almost surely, 2^3971505990 is an apocalyptic number.

3971505990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3971505990 is an abundant number, since it is smaller than the sum of its proper divisors (5560108458).

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

3971505990 is a wasteful number, since it uses less digits than its factorization.

3971505990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132383543.

The product of its (nonzero) digits is 382725, while the sum is 48.

The square root of 3971505990 is about 63019.8856711118. The cubic root of 3971505990 is about 1583.6227810874.

The spelling of 3971505990 in words is "three billion, nine hundred seventy-one million, five hundred five thousand, nine hundred ninety".