947977990 has 8 divisors (see below), whose sum is σ = 1706360400. Its totient is φ = 379191192.

The previous prime is 947977973. The next prime is 947977991. The reversal of 947977990 is 99779749.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947977991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47398890 + ... + 47398909.

It is an arithmetic number, because the mean of its divisors is an integer number (213295050).

Almost surely, 2^947977990 is an apocalyptic number.

947977990 is a deficient number, since it is larger than the sum of its proper divisors (758382410).

947977990 is a wasteful number, since it uses less digits than its factorization.

947977990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94797806.

The product of its (nonzero) digits is 9001692, while the sum is 61.

The square root of 947977990 is about 30789.2512088229. The cubic root of 947977990 is about 982.3496272486.

The spelling of 947977990 in words is "nine hundred forty-seven million, nine hundred seventy-seven thousand, nine hundred ninety".