216499974 has 32 divisors (see below), whose sum is σ = 439779840. Its totient is φ = 71042400.

The previous prime is 216499973. The next prime is 216499979. The reversal of 216499974 is 479994612.

It is a happy number.

216499974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216499973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312969 + ... + 313659.

It is an arithmetic number, because the mean of its divisors is an integer number (13743120).

Almost surely, 2^216499974 is an apocalyptic number.

216499974 is an abundant number, since it is smaller than the sum of its proper divisors (223279866).

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

216499974 is a wasteful number, since it uses less digits than its factorization.

216499974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its digits is 979776, while the sum is 51.

The square root of 216499974 is about 14713.9380860462. The cubic root of 216499974 is about 600.4625821601.

The spelling of 216499974 in words is "two hundred sixteen million, four hundred ninety-nine thousand, nine hundred seventy-four".