42721790 has 32 divisors (see below), whose sum is σ = 79824096. Its totient is φ = 16450560.

The previous prime is 42721771. The next prime is 42721801. The reversal of 42721790 is 9712724.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30710 + ... + 32070.

It is an arithmetic number, because the mean of its divisors is an integer number (2494503).

Almost surely, 2^42721790 is an apocalyptic number.

42721790 is a deficient number, since it is larger than the sum of its proper divisors (37102306).

42721790 is a wasteful number, since it uses less digits than its factorization.

42721790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 42721790 is about 6536.1907866891. The cubic root of 42721790 is about 349.5826044700.

The spelling of 42721790 in words is "forty-two million, seven hundred twenty-one thousand, seven hundred ninety".