1947493021 has 8 divisors (see below), whose sum is σ = 2065493304. Its totient is φ = 1829875200.

The previous prime is 1947493001. The next prime is 1947493043. The reversal of 1947493021 is 1203947491.

It can be written as a sum of positive squares in 4 ways, for example, as 905107225 + 1042385796 = 30085^2 + 32286^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1947493021 - 2¹¹ = 1947490973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947493001) 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, 85090 + ... + 105523.

It is an arithmetic number, because the mean of its divisors is an integer number (258186663).

Almost surely, 2^1947493021 is an apocalyptic number.

It is an amenable number.

1947493021 is a deficient number, since it is larger than the sum of its proper divisors (118000283).

1947493021 is a wasteful number, since it uses less digits than its factorization.

1947493021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191231.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1947493021 is about 44130.4092548438. The cubic root of 1947493021 is about 1248.7973544327.

The spelling of 1947493021 in words is "one billion, nine hundred forty-seven million, four hundred ninety-three thousand, twenty-one".