29621940 has 48 divisors (see below), whose sum is σ = 84090048. Its totient is φ = 7789824.

The previous prime is 29621923. The next prime is 29621947. The reversal of 29621940 is 4912692.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29621947) 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, 999 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (1751876).

Almost surely, 2^29621940 is an apocalyptic number.

29621940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29621940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42045024).

29621940 is an abundant number, since it is smaller than the sum of its proper divisors (54468108).

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

29621940 is a wasteful number, since it uses less digits than its factorization.

29621940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6848 (or 6846 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 29621940 is about 5442.6041561003. The cubic root of 29621940 is about 309.4124841838.

The spelling of 29621940 in words is "twenty-nine million, six hundred twenty-one thousand, nine hundred forty".